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Claudian letters
Claudian letters
Claudian letters
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Claudian letters, with the variant of antisigma supported by manuscripts of Priscian.[1]
Claudian letters with the Ↄ variant of antisigma.
Claudian pomerium marker, where written words ampliavit and terminavit use turned digamma (highlighted in red)

The Claudian letters were a set of three new letters for the Latin alphabet developed by the Roman emperor Claudius, who reigned the Roman Empire from the year 41 to the year 54. These letters, according to the emperor, were much needed for the language, although they did not outlast his reign.

Antisigma (Ↄ)

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Ↄ or /X (antisigma) to replace BS [bz] and PS [ps], much as X stood in for CS [ks] and GS [ɡz]. The shape of this letter is disputed, however, since no inscription bearing it has been found. Franz Bücheler identified it with the variant Roman numeral Ↄ,[2] but 20th-century philologists, working from copies of Priscian's books, believe it to instead resemble two linked Cs (Ↄ+Ϲ), which was a preexisting variant of Greek sigma, and easily mistaken for X by later writers. Revilo P. Oliver argued that Claudius would have based this letter upon the Arcadian variant of psi or .[1] This letter should not be confused with the "open O" letter. (Ɔ)

As noted, there are no examples of this letter being used at the time currently discovered; however, it is possible to assume where this letter would be utilized. It would probably replace the PS or BS sequence in Latin words, especially those with Greek etymology, such as DYSPEↃIA (dyspepsia), EPILEↃIA (epilepsia), ↃALMVS (psalmus), or VRↃ (urbs).

Digamma inversum (Ⅎ)

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Ⅎ, a turned F or digamma (digamma inversum) to be used instead of the letter V when denoting the consonantal phoneme [w] or [β].[2] Thus, it resembles the use of the letter V in modern Latin texts, where the vocalic use of the letter V is represented by its variant U, which has been recognized as a different letter only later.

Examples of Ⅎ: AMPLIAℲIT (ampliavit), ARℲALES (arvales), ARℲALIVM (arvalium), BOℲE (bove), IOℲI (Iovi), TERMINAℲITQVE (terminavitque), VOℲIMVS (vovimus), ℲELINA (Velina), ℲIR (vir), ℲOℲEMVS (vovemus).[3][4]

Half H (Ⱶ)

[edit]

Ⱶ, a half H, probably had the name /ʉː/ in harmony with other vowels. The value of this letter is unclear, but it may have represented the so-called sonus medius, a short vowel sound, likely [ʉ], but it could have also been [ɨ]. It was used before labial consonants in Latin words such as optumus and optimus. The letter was later used as a variant of [y] in inscriptions for short Greek upsilon (as in Olympicus). It may have disappeared because the sonus medius itself disappeared from spoken language.[1][citation needed]

Examples of Ⱶ: BⱵBLIOTHECA (bibliotheca), CⱵCNVS (cycnus), MAXⱵMVS (maximus), OPTⱵME (optime), and once in GⱵBERNATOR (gubernator).[3][5]

Usage

[edit]

These letters were used to a small extent on public inscriptions dating from Claudius' reign, but their use was abandoned after his death.[6] Their forms were probably chosen to ease the transition, as they could be made from templates for existing letters. He may have been inspired by his ancestor Appius Claudius the Censor, who made earlier changes to the Latin alphabet.[7] Claudius did indeed introduce his letters during his own term as censor (47–48), using arguments preserved in the historian Tacitus' account of his reign, although the original proclamation is no longer extant. Suetonius said of Claudius' letters:

Besides this he [Claudius] invented three new letters and added them to the alphabet, maintaining that they were greatly needed; he published a book on their theory when he was still in private life, and when he became emperor had no difficulty in bringing about their general use. These characters may still be seen in numerous books, in the [state] registers, and in inscriptions on public buildings.[8]

Assuming that the letters were added at the end of the alphabet, just like Y and Z were, and that the order of these 3 letters does not matter, the Latin alphabet with these letters would look like this:

Classical Latin alphabet with the additional Claudian letters
Letter A B C D E F G H I K L M N O P Q R S T V X Y Z Ↄ Ⅎ Ⱶ
IPA /a/
/aː/		 /b/ /k/ /d/ /e/
/eː/		 /f/ /g/ /h/ /i/
/iː/
/j/		 /k/ /l/ /m/ /n/ /o/
/oː/		 /p/ /k/ /r/ /s/ /t/ /u/
/uː/		 /ks/
/gz/		 /y/
/yː/		 /z/ /ps/
/bz/		 /w/ /ɨ ~ ʉ/

Support for the letters was added in version 5.0.0 of Unicode.[9] Although these letters, as all Latin letters in antiquity, originally occurred only in capital form, lowercase forms were introduced to meet Unicode casing requirements.[9] The minuscule form for the turned F was designed as a turned small capital F and should not be confused with the IPA symbol ɟ representing a voiced palatal stop.

The letters are encoded as follows:

Description Letter Unicode HTML Script
TURNED CAPITAL F
TURNED SMALL F		 Ⅎ
ⅎ		 U+2132
U+214E		 Ⅎ
ⅎ		 Latin
ROMAN NUMERAL REVERSED ONE HUNDRED
LATIN SMALL LETTER REVERSED C		 Ↄ
ↄ		 U+2183
U+2184		 Ↄ
ↄ		 Latin
LATIN CAPITAL LETTER HALF H
LATIN SMALL LETTER HALF H		 Ⱶ
ⱶ		 U+2C75
U+2C76		 Ⱶ
ⱶ		 Latin

See also

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References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Claudian letters

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from Grokipedia
The Claudian letters were three innovative characters added to the Latin alphabet by in AD 47, aimed at improving the script's capacity to denote specific phonetic distinctions absent in the traditional 23-letter system. These letters included one to represent the intermediate sound between u and i (as in maxumus or maximus), a reversed C (known as the antisigma, Ↄ) to signify the bs or ps, and another for the consonantal u (distinguishing it from the ). , a with a deep interest in and history, had outlined their theoretical basis in a book written during his private life and introduced them officially as censor in 47 AD. Their implementation reflected Claudius' broader administrative and cultural reforms during his reign (AD 41–54), including efforts to standardize Roman orthography amid the empire's expansion and linguistic evolution. The letters appeared in contemporary documents such as books, the daily acta diurna gazette, and public inscriptions on buildings and bronzes, with epigraphic evidence surviving in Roman artifacts like those cataloged in the Corpus Inscriptionum Latinarum (e.g., CIL VI 31537 for the consonantal u (Ⅎ) and CIL VI 553 for the u-i intermediate (Ⱶ)). Contemporary historian Tacitus noted their introduction as part of Claudius' censorial duties, observing their use in official contexts during his lifetime but their subsequent obsolescence after the emperor's death in AD 54. Despite initial widespread adoption, the failed to endure beyond the , likely due to resistance from traditionalists and the inertia of established scribal practices; by the Flavian era, they had largely vanished from use, leaving only fragmentary traces in inscriptions and later scholarly references. This brief experiment underscores ' intellectual ambitions to refine Latin as a tool for imperial administration and , though it highlights the challenges of orthographic reform in a vast, multilingual empire.

Historical Background

Emperor Claudius's Reign and Reforms

Tiberius Claudius Caesar Augustus Germanicus ascended to the imperial throne in 41 AD at the age of 50, following the of his nephew on January 24. Frightened by the chaos, he had concealed himself behind a curtain in the imperial palace when a soldier of the discovered him, dragged him forth, and saluted him as emperor; the Guard then bore him to their camp on their shoulders, where they acclaimed him and secured his position with a donative of 15,000 sesterces per man. This improbable elevation by military acclamation, bypassing the Senate's initial deliberations, initiated a that endured until his in 54 AD, transforming the perceived family invalid into a pivotal Julio-Claudian ruler. Claudius's scholarly inclinations stemmed from a youth marred by physical impairments—infantile convulsions, a limp, stammering, and tremors—that marginalized him from public life under , , and , confining him to private study. He produced voluminous works, including twenty books on (Tyrrhenica) and eight on Carthaginian history (), both composed in Greek, alongside treatises on Roman civil wars, Augustus's reign, dice games, and an autobiography in eight volumes. His deep engagement with linguistics and antiquities drew inspiration from his patrician ancestor , the censor of 312 BC renowned for orthographic adjustments to the Latin alphabet and inclusive senatorial reforms; Claudius invoked Appius's precedent in a senatorial speech to justify admitting sons of freedmen to the equestrian order, interpreting libertini broadly to align with ancestral egalitarianism. In 47 AD, after a hiatus of nearly sixty years since the last censorship, revived and assumed the office jointly with Lucius Vitellius, holding it through 48 AD to emulate the transformative censuses of forebears like . He orchestrated a comprehensive to tally Roman citizens, purged the senatorial and equestrian rolls by expelling 35 senators and numerous knights for lapses or incompetence—such as ignorance of Latin—and replenished their ranks by adlecting qualified provincials, including and , to integrate the empire's peripheries into the ruling class. Judicial reforms curbed by capping advocates' fees at 10,000 sesterces, prohibited usurious loans to minors secured against paternal inheritance, and expanded procurators' fiscal jurisdiction in provinces to streamline administration and reduce senatorial interference. These initiatives, coupled with the revival of the in 47 AD to commemorate Rome's 800th founding year and the creation of a state-funded of Etruscan haruspices, exemplified 's commitment to , legal, and renewal. Ancient historians depicted as a "scholar-emperor" whose acumen compensated for bodily frailties, presenting him as tall and imposing when seated but awkward in motion, with a habit of slobbering and uncontrolled laughter. praised his erudition and diligent governance, noting his voracious reading and authorship, while acknowledged his administrative vigor—such as aqueduct expansions and legal edicts—but critiqued his credulity toward freedmen advisors and wives. This duality underscored 's reign as one of scholarly-driven reform, setting the stage for alphabetic innovations akin to Appius's precedents.

Motivation and Introduction

The Claudian letters represent an ambitious attempt by Emperor Claudius to the Latin alphabet, which at the time consisted of 23 letters and was seen as insufficient for expressing certain contemporary sounds in the evolving Roman . Claudius's primary motivation was to enhance the precision and expressiveness of Latin , drawing inspiration from the historical development of earlier alphabets, including Greek and Etruscan influences that had shaped the itself. He argued that just as the Greek alphabet had been incrementally expanded over time rather than created in a single moment, the Latin alphabet required similar augmentation to accommodate phonetic nuances not adequately covered by its classical form, such as distinctions between qualities and clusters. This was rooted in Claudius's scholarly background in and history, reflecting a broader interest in standardizing Roman writing practices for clarity and administrative purposes. The announcement of the reform occurred during Claudius's tenure as censor in 47–48 AD, a role that positioned him to oversee moral, cultural, and administrative standards across the empire. In this capacity, he presented a —a formal or proposal—to the , outlining the theoretical basis for adding three new letters and advocating for their adoption to streamline official documentation and public inscriptions. records that had earlier composed a book on the subject during his private life, underscoring his long-standing conviction that these additions were "greatly needed" for the language's practical utility. The timing aligned with his censorial duties, which included efforts to promote uniformity in Roman governance, as the expanded was intended to facilitate more efficient communication in legal, epistolary, and monumental contexts amid the empire's growing bureaucratic demands. This initiative echoed earlier Roman linguistic reforms, notably those under , the censor of 312 BC, who had streamlined the by removing letters like , deemed unnecessary for Latin , thereby reducing it from 21 to a more functional set. the emperor positioned his own changes as a continuation of this tradition of adaptation, invoking historical precedents to justify expansion rather than contraction, and thereby linking his reform to the family's legacy of innovation in Roman institutions. By compelling the use of the new letters in official gazettes, books, and inscriptions shortly after the senatorial presentation in 47 AD during his censorship, he sought to embed them rapidly into everyday imperial administration.

Description of the Letters

Antisigma (Ↄ)

The antisigma (Ↄ), one of the three new letters proposed by Emperor Claudius for the Latin alphabet in AD 47, is described in ancient sources as resembling a reversed capital C, though its exact shape is subject to scholarly debate due to the absence of surviving inscriptions; it has been depicted in some representations as a chi-like form or a ligature of two linked Cs facing outward. This form drew inspiration from the Greek antisigma, an archaic letter variant opposed to sigma (Σ), and was also employed in Roman numeral notation to denote 500, predating its Claudian use as a distinct alphabetic symbol. Priscian, in his Institutiones Grammaticae (c. AD 500), explicitly names it "antisigma" and notes that Claudius wished it to be written in this figure, though he observes that scribes dared not alter traditional orthography. The proposed phonetic value of the antisigma was for the consonant cluster /ps/ or /bs/, analogous to the Greek psi (Ψ), aiming to streamline writing by replacing cumbersome digraphs like PS or BS that could introduce orthographic ambiguity in Latin words. For instance, it was intended for terms such as dyspepsia, rendered as DYSPEↃIA, to denote the blended sound more efficiently and reflect evolving pronunciations in late Republican and early Imperial Latin. This reform sought to address perceived deficiencies in the 23-letter Latin alphabet, particularly for Greek loanwords and compound forms where such clusters were common. Despite Claudius's efforts to implement the antisigma during his censorship—evidenced by its appearance in official inscriptions and publications like the —no surviving epigraphic examples have been identified, suggesting its adoption was fleeting and confined to his reign (AD 41–54). records the introduction but notes the letters' ultimate rejection after Claudius's death, underscoring their limited practical impact on Latin .

Digamma Inversum (Ⅎ)

The digamma inversum, denoted as Ⅎ, was one of three additional letters introduced by Emperor Claudius to the Latin alphabet around 47–49 CE. Its shape consists of an inverted form of the Greek letter digamma (Ϝ), resembling a reversed capital F, which was originally used in archaic Greek to represent the semivowel /w/. This design drew from the historical association of the digamma with the /w/ sound, adapting it to Latin epigraphy where the existing letter V ambiguously served both as a vowel /u/ and a consonantal /w/. The primary phonetic value of the digamma inversum was to denote the consonantal /w/, particularly in intervocalic or initial positions where classical Latin used V for both vocalic and semivocalic functions. For instance, in the verb form "ampliavit" (he enlarged), it appears as AMPLIAℲIT, distinguishing the semivowel from the vowel /u/ and thereby reviving an archaic Latin distinction that had been lost by the classical period, when the alphabet no longer differentiated these sounds explicitly. This reform aimed to enhance orthographic precision for sounds rooted in early Italic phonetics, reflecting Claudius's scholarly interest in etymology and linguistic history. Evidence for the digamma inversum's use is limited to a handful of inscriptions from Claudius's reign, primarily boundary markers (cippi) erected in 49 CE to delineate the expanded , Rome's sacred boundary. One such example, preserved in the (inventory no. 9268), reads IMP·CAESAR·TI·CLAVDIVS·[...]·AMPLIAℲIT TERMINAℲITQVE, employing the letter twice to mark the consonantal /w/ in "ampliavit" and "terminavit." Another cippus discovered in 2021 near Piazza Augusto Imperatore in the area similarly features the digamma inversum, confirming its application in official monumental texts during the short period of adoption. No extensive literary or cursive uses survive, underscoring the letter's brief and localized epigraphic role.

Half H (Ⱶ)

The Half H, denoted by the symbol Ⱶ, features a distinctive shape comprising the right half of the Latin letter H. This design was part of Emperor Claudius's effort to expand the Latin alphabet with letters for underrepresented sounds. Its proposed phonetic role was to denote the sonus medius, an intermediate vowel sound between /u/ and /i/, interpreted as a central vowel such as /ʉ/ or /ɨ/. According to Suetonius, Claudius introduced this letter specifically for such a sound, which lacked clear representation in the existing Latin vowel system. The Half H was intended for use in particular phonetic contexts, notably in words like optume (from optimus), transcribed as OPTⱵME, to distinguish vowel qualities that varied in pronunciation. An attested example appears in CIL VI 553, an inscription featuring SATⱵR (for Satyr) and NⱵMPHABUS (for Nymphabus, dat. pl.), illustrating its rare epigraphic use. The letter's purpose stemmed from efforts to incorporate distinctions influenced by Oscan and Umbrian languages, where analogous appeared, thereby enriching Latin's capacity to capture phonetic nuances absent or ambiguous in classical usage. Despite this conceptual aim, attestations of Ⱶ remain exceedingly rare, confined largely to theoretical descriptions in ancient accounts and sporadic epigraphic from Claudius's , with no of broad implementation.

Usage and Evidence

In Inscriptions and Documents

Additional examples of Claudian letters are found in a series of seven surviving pomerium markers—cylindrical boundary stones erected in 49 AD to delineate the expanded sacred boundary of Rome under Claudius's direction as censor. These public monuments, such as CIL VI 1231c and CIL VI 31537a–d, incorporate the digamma inversum in phrases like ampliavit terminavitque, consistently using it for the semi-consonantal /w/ sound in official Latin. The half H (Ⱶ) also appears in a limited number of senatorial and public inscriptions from the period 47–54 AD, including dedications and honorific texts where it denotes a medial sound between /i/ and /u/, such as in CⱵCNVS (for Cycnus) and BⱵBLIOTHECA (for bibliotheca); no verified instances of the antisigma (Ↄ) have been identified in any surviving inscriptions. These letters were employed in contexts of official Roman administration, particularly during Claudius's , including senatorial decrees, public boundary markers, and monumental bronze tablets like the Tablet, which served propagandistic and legal purposes to publicize imperial reforms. No evidence exists for their use on coins, which adhered to traditional letter forms, but building inscriptions and other civic documents from reflect their limited adoption in elite and state-sponsored . Surviving fragments reveal variations in the carving styles of the , executed in monumental capital script typical of Julio-Claudian . The inversum is often rendered as a rotated F with serifs matching surrounding letters, though some markers show slight asymmetries in stroke width due to mason workshops (officinae) in ; the half H appears as a bisected eta-like form, with inconsistent curvature in fragments, suggesting adaptation by engravers unfamiliar with the . These stylistic differences highlight the letters' experimental nature and restricted before their discontinuation after Claudius's death in 54 AD.

Literary and Historical References

Suetonius, in his biography The Life of Claudius composed around 121 AD, provides one of the earliest detailed accounts of the Claudian letters. He recounts that Claudius invented three new letters and incorporated them into the Latin alphabet, insisting on their necessity, and had earlier authored a treatise outlining their rationale during his private years. As emperor, Claudius successfully enforced their adoption, with the symbols appearing in various books, the acta diurna (daily public records), and public inscriptions. Tacitus, writing in his Annals circa 116 AD, documents the reform during Claudius's censorship in 47 AD, noting Senate approval for the addition of three letters. Tacitus describes Claudius's defense of the change through a historical justification, emphasizing that the Latin alphabet had evolved incrementally from earlier Greek and Etruscan forms, and observes that the letters were employed briefly before falling out of use, though traces remained on official bronze tablets. Quintilian, in his Institutio Oratoria (circa 95 AD), references the Claudian innovation while discussing orthographic practices in Book 1, Chapter 7. He specifically praises Claudius's introduction of the Aeolic digamma (Ⅎ) to denote the consonantal "u" sound in words like seruus, arguing it prevented phonetic confusion from double vowels, though he notes contemporary preferences for "uu" over the older "uo" spelling. Quintilian presents this as a practical linguistic adjustment rooted in classical precedents. Sextus Pompeius Festus, in his 2nd-century lexicon De Verborum Significatu, preserves explanations of the Claudian letters drawn from earlier antiquarian sources like Verrius Flaccus. He defines the antisigma (Ↄ) as a symbol for the "bs" sound (equivalent to Greek psi), the half-H (Ⱶ) for hard "u" as a , and the inverted (Ⅎ) for the "v" sound, providing etymological notes on their intended phonetic roles and limited adoption in official contexts.

Legacy and Modern Relevance

Discontinuation and Reasons

The Claudian letters experienced rapid discontinuation following Emperor Claudius's death in AD 54, coinciding with Nero's accession to the . While the letters had seen limited official use during Claudius's , particularly in inscriptions and public documents from his in AD 47 onward, their appearance dwindled almost immediately after his passing. By the 60s AD, they had been entirely removed from official contexts, with no surviving evidence of sustained adoption in Roman administrative or literary practices. Several interconnected factors contributed to this swift abandonment. The , which had shown lukewarm enthusiasm even under , offered no backing to perpetuate the changes, while traditionalist scholars and scribes resisted altering the venerable Latin alphabet, viewing the additions as unnecessary innovations. Furthermore, the letters were designed to represent phonetic distinctions—such as the semivowel /w/ or the cluster /ps/—that were increasingly obsolete in evolving spoken Latin, diminishing any practical imperative for their retention. No revival efforts occurred throughout the , and references to the letters became increasingly rare and retrospective. By the late 1st century AD, the rhetorician declined to employ them in his , noting that public usage had rejected them. In the , grammarian Velius Longus discussed the letters in his De Orthographia solely as antiquarian notes, treating them as obsolete curiosities rather than viable elements of contemporary .

Representation in Unicode and Scholarship

The Claudian letters were incorporated into the Unicode Standard with version 5.0.0, released in 2006, to support the encoding of ancient Latin epigraphy and related scholarly texts. This addition placed the characters in the Latin Extended-C block (U+2C60–U+2C7F) for the half H forms and unified existing characters from other blocks for the reversed C and turned F. Specifically, the capital and lowercase variants are assigned as follows: reversed C (antisigma) at U+2183 (Ↄ) and U+2184 (ↄ); turned F (digamma inversum) at U+2132 (Ⅎ) and U+214E (ⅎ); half H at U+2C75 (Ⱶ) and U+2C76 (ⱶ). These code points were proposed by linguist Michael Everson in 2005, drawing on epigraphic evidence to ensure compatibility with digital representations of classical texts, including lowercase forms added for typographic pairing despite their absence in ancient usage. Scholarly analysis of the Claudian letters has been advanced by mid-20th-century studies, notably Revilo P. Oliver's 1949 article "The Claudian Letter I," which examined the reversed C (antisigma) through surviving inscriptions and critiqued earlier assumptions about its phonetic role in representing /ps/ or /bs/ clusters. Oliver's work, published in the American Journal of Archaeology, highlighted the letter's limited attestation and proposed its derivation from archaic Greek forms, influencing subsequent paleographic research. Later scholarship, such as René Cagnat's 1914 Cours d’épigraphie latine and David Diringer's 1968 The Alphabet: A Key to the History of Mankind, built on this by integrating the letters into broader histories of evolution, emphasizing their role in imperial orthographic reform. In contemporary scholarship, the Claudian letters are employed in paleography and projects to transcribe and analyze ancient inscriptions accurately. The EpiDoc guidelines for encoding classical texts recommend using these Unicode characters directly in XML markup for Latin words containing them, facilitating searchable digital corpora of epigraphic material. Fonts supporting these glyphs, such as those developed under the Medieval Unicode Font Initiative (MUFI), enable their rendering in academic publications and online resources, aiding studies in . Current knowledge of the Claudian letters remains constrained by sparse epigraphic evidence, with only a handful of inscriptions preserving them, as noted in analyses of the Corpus Inscriptionum Latinarum. This scarcity limits definitive phonetic reconstructions; for instance, the turned F's value as a consonantal /w/ or /v/ and the half H's representation of a mid-central vowel require further comparative linguistic approaches, potentially drawing on Indo-European cognates, to resolve ambiguities. Additional archaeological finds could clarify their pronunciation and adoption patterns, addressing ongoing debates in Latin phonology.

References

  1. https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Claudius*.html
  2. https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Tacitus/Annals/11A*.html
  3. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Claudius*.html#10
  4. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Claudius*.html#3
  5. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Claudius*.html#41
  6. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Claudius*.html#24
  7. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Claudius*.html#16
  8. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Tacitus/Annals/11A*.html#23
  9. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Tacitus/Annals/11A*.html#7
  10. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Tacitus/Annals/11A*.html#11
  11. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Claudius*.html#30
  12. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Tacitus/Annals/11A*.html#13
  13. http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Suetonius/12Caesars/Claudius*.html#17
  14. https://www.jstor.org/stable/295428
  15. https://www.gutenberg.org/files/28994/28994-h/28994-h.htm
  16. https://ia800107.us.archive.org/18/items/PriscianiInstitutionumGrammaticarumLibri/PriscianiInstitutionumGrammaticarumLibriI-xiihertz.1855_text.pdf
  17. https://www.unicode.org/L2/L2005/05193r2-n2960r2-claudian.pdf
  18. https://perseids-publications.github.io/harrington-trees/docs/harrington-latin-grammar-2016.pdf
  19. https://www.jstor.org/stable/45019241
  20. https://www.smithsonianmag.com/smart-news/rare-boundary-stone-dated-emperor-claudius-reign-unearthed-rome-180978362/
  21. https://ora.ox.ac.uk/objects/uuid:503754f7-5be5-45d6-9bb0-bb13c56f39de/files/m2b8734247cf402fcc70284cc45544b85
  22. https://www.academia.edu/9578796/_Inscribing_Roman_Texts_Officinae_Layout_and_Carving_Techniques_in_The_Oxford_Handbook_of_Roman_Epigraphy_eds_C_Bruun_and_J_Edmondson_New_York_and_Oxford_Oxford_University_Press_2015_2014_ch_7_pp_111_130_
  23. https://www.jstor.org/stable/500662
  24. https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Quintilian/Institutio_Oratoria/1C*.html
  25. https://archive.org/details/deverborumsigni00fest
  26. https://www.uvm.edu/~jbailly/courses/LundquistLatinHistoryPrehistory/Wallace%20Latin%20alphabet%20from%20Clackson%202013%20Companion%20to%20the%20Latin%20Language-2.pdf
  27. https://epidoc.stoa.org/gl/latest/trans-claudian.html
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