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Potin is a base metal alloy used in coins. It is typically a mixture of copper, tin and lead (in varying proportions) and does not typically contain significant precious metals. Potin is usually used in reference to Celtic coinage.[1][2]

In Celtic coinage

[edit]
Iron Age class I potin ('Thurrock' type), c. 100 BC

In 1890, so-called Potin lumps were found, of which the largest weighs 59.2 kilograms (131 lb), at the Prehistoric pile dwelling settlement Alpenquai in Zürich (Vicus Turicum) in Switzerland. The pieces consist of a large number of fused Celtic coins, which are mixed with charcoal remnants. Some of the about 18,000 coins originate from the Eastern Gaul, and others are of the Zürich type, that were assigned to the local Helvetii, which date to around 100 BC. The find is so far unique, and the scientific research assumes that the melting down of the lump was not completed, therefore the aim was to form cult offerings. The site of the find was at that time at least 50 metres (164 ft) from the lake shore, and probably 1 metre (3 ft) to 3 metres (10 ft) deep in the water.[3][4]

Kentish cast bronzes (historically referred to as Thurrock potins) appear to have been the first coins made in Britain dating from the end of the second century BC.[5][6] They appear to have circulated mainly in Kent and were based on coins issued by Massalia (now Marseille).[5]

See also

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References

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Potin

View on Grokipedia
from Grokipedia
Potin is a brittle , primarily composed of with a high tin content (up to 25%) and often lead, used by Celtic tribes in and parts of Britain to produce low-denomination coins during the late , roughly from the mid-2nd century BC to the early AD. These coins, distinct from struck or silver issues, were in simple clay molds, resulting in their characteristic grayish-black , crude designs, and irregular shapes, typically weighing 2–7 grams and measuring 10–23 mm in diameter. The 's low melting point facilitated production under primitive conditions, making potin coinage an accessible medium for local economies. The widespread use of potin reflects the adoption of coinage systems influenced by Mediterranean trade, particularly with Greek merchants, evolving from elite prestige currencies to practical tools for everyday commerce by the . Various tribes, including the Aulerci Eburovices, Bellovaci, , and those in Kentish Britain, issued potin coins featuring stylized motifs such as heads, animals, or abstract symbols, often imitating earlier Philippus-style staters but adapted to local Celtic aesthetics. Unlike higher-value metals, potin functioned as , valued by communal acceptance rather than intrinsic worth, supporting regional trade networks and economic diversification in oppida settlements. Potin coinage declined following the Roman conquest of by around 50 BC, though some production persisted into the early Imperial period in Britain, and examples appear in Romano-Egyptian issues. Today, these coins are valued by numismatists for their insight into pre-Roman Celtic society, with hoards like those from in Britain highlighting cross-channel exchanges. The term "potin" itself originates from 19th-century French metallurgical nomenclature, describing the alloy's resemblance to materials used in .

Definition and Composition

Chemical Makeup

Potin is an primarily composed of as the , constituting the majority of its content, with tin added in proportions up to around 30% and lead in varying amounts to mitigate and improve castability. This combination forms a high-tin that was well-suited for production due to its relatively low , enabling straightforward processes. Unlike billon, which incorporates silver or other precious metals, potin contains no significant quantities of or silver, making it a distinctly used for lower-value . Regional variations in composition reflect local resource availability and production techniques. In potins, such as those from the Turones tribe, early examples typically exhibit higher tin levels exceeding 20% to further reduce the , alongside about 5% lead, resulting in roughly 75% ; later 1st-century BCE specimens shift to around 5% tin and up to 25% lead. potins, including types and flat-linear series, show tin contents of 17-18% in early forms, rising to over 20% and sometimes exceeding 30% in later variants, with lead sometimes added in varying amounts to enhance fluidity during . Metallurgical analyses of potin coins, such as those from hoards like the Turones examples, confirm typical ratios of 60-80% , 5-30% tin, and 0-25% lead, though can skew surface readings and underestimate original tin levels.

Physical Characteristics

Potin coins are characterized by a gray to black that forms on their surface over time, resulting from natural oxidation processes. This contributes to their distinctive appearance, often presenting a smooth and hard texture that can resemble a polished finish. In terms of size, potin coins typically weigh between 2 and 7 grams and measure 10 to 23 millimeters in , varying by type and region of production. Examples from collections confirm these ranges, such as a Kentish potin coin weighing 2.198 grams and 18 millimeters in . The high tin content in the enhances the coins' resistance to everyday wear, providing a that supported their use in circulation. However, potin coins are susceptible to in burial environments, where and minerals promote degradation, often leading to significant surface alteration. A key distinguishing feature is the irregular edges resulting from the casting process, frequently exhibiting runnulets or rough borders, which differ markedly from the even, smooth rims of struck coinage.

Historical Development

Origins in Celtic Societies

Potin coinage emerged among the Iron Age Celts of Gaul and Britain as a form of token currency primarily intended for everyday local trade and transactions, distinct from the higher-value gold and silver coins reserved for prestige, diplomacy, and long-distance exchange. This development reflected the Celts' adaptation of Mediterranean monetary practices to their agrarian and kinship-based economies, where smaller denominations facilitated commerce in rural settlements and emerging oppida without requiring precious metals. The origins of potin coinage trace back to external influences from the Greek colony of (modern ), whose struck bronze coins around 150 BC served as prototypes for early Celtic cast potins, particularly in designs featuring heads and animal motifs. Additionally, an indirect impact stemmed from trade networks that introduced Philip II of Macedon's gold staters to Celtic regions in the late , inspiring broader coin imitation practices that later extended to base-metal issues like potin. These influences arrived via Gallic mercenaries in and Mediterranean commerce routes, blending foreign techniques with local metallurgical traditions. In Celtic societies, potin was issued by various tribes, such as the in central and the Aulerci in northwestern , underscoring the decentralized nature of production in tribal economies that lacked unified central mints or state-controlled facilities. Instead, coinage occurred at a local or tribal level, often in temporary workshops near settlements, aligning with the fragmented political structure of Celtic groups where authority rested with chieftains rather than centralized institutions. The earliest evidence of potin coinage appears in the late , with finds in (southeast Britain) and central , coinciding with Celtic migrations from central that brought new economic practices and intensified cross-Channel contacts. These migrations, involving groups like the , facilitated the spread of coin-using habits from to Britain, marking potin's role in integrating disparate tribal networks.

Timeline of Production

The production of potin coins, a cast alloy primarily used by Celtic tribes, began in the early phase around 150–100 BC, with initial issuances in both and Britain influenced by Mediterranean trade routes and exposure to coinage from (modern ). In northern , potin coins emerged in the mid- as part of a broader shift toward standardized currencies, including silver quinarii, to facilitate trade and payments. In Britain, the earliest examples, such as the Thurrock types, appeared in during the second half of the , imitating coins from and linked to the influx of Gallo-Belgic gold. The peak period of potin production occurred between 100 and 50 BC, marked by widespread tribal issuance across and southeast Britain amid growing threats from Roman expansion. In , potin coinage proliferated in the late 2nd and early 1st centuries BC, supporting economic integration and trade with , with numerous regional variants produced by tribes like the and Suessiones. In Britain, this era saw the evolution from types to flat-linear series around 100 BC, with peak activity in mid-1st century BC contexts, as evidenced by hoards like associated with Caesar's invasions of 55–54 BC. Potin production entered a phase of decline after 50 BC, disrupted by Julius Caesar's (58–50 BC), which led to in designs and reduced output as Roman control over intensified. In , issuance largely ceased following the Roman conquest, with no significant potin minting after the establishment of the province under around 27 BC. In Britain, potin coins were produced until the late 1st century BC, with Class II types in the mid-1st century BC, after which other local coinages and Roman coinage supplanted production following the Claudian invasion in 43 AD.

Manufacturing Methods

Casting Techniques

Potin coins were primarily produced using a technique involving two-piece clay molds, which allowed for the direct formation of the coin's during the pouring . These molds were prepared by impressing patterns, existing coins, or carved designs into soft clay to create matching cavities, often arranged in strips with multiple interconnected cavities—typically 5 to 6 per mold—to enable simultaneous production of several coins. Channels or runners were cut into the clay to connect the cavities, facilitating the flow of molten metal and improving efficiency in tribal workshops. Once assembled, the molds were positioned upright, and the potin alloy was melted in a before being poured as a molten at temperatures of 900–1000°C into the cavities through a top in the runner . This process capitalized on the alloy's relatively low , resulting from its high tin and lead content, which enhanced fluidity and allowed under primitive conditions without advanced equipment. The metal filled the shallow cavities (often less than 1 mm deep), capturing the designs directly and producing linked strips of coins upon cooling. Following solidification, the clay molds were broken apart to release the strips, after which the individual coins were separated by snapping, chiseling, or clipping along the sprues and runners. Excess metal from the edges and channels was trimmed using knives, with remnants often recycled by remelting flawed pieces. The alloy's composition and the process obviated the need for post-casting annealing or additional , as the coins were used in their as-cast state. Incomplete or defective castings were typically remelted to minimize waste. This casting method offered significant advantages for , bypassing the requirements for heavy hammers, engraved dies, or highly skilled labor associated with striking techniques. It enabled rapid output in decentralized workshops, supporting the widespread circulation of potin coinage across Celtic regions with minimal technological barriers.

Design Replication Processes

The creation of initial designs for potin coins often involved transferring motifs from earlier prototypes, such as Greek or preceding , by pressing these exemplars into soft clay to form molds. This impression technique captured the relief details of the original, allowing for the production of negative molds that could then be used in . For unique or original designs, moneyers resorted to hand-carving directly into the clay using a sharp implement, enabling the adaptation of foreign influences into local styles. Over successive generations of replication, potin designs evolved from relatively realistic representations, such as detailed heads inspired by Apollo on Massalia bronzes, to increasingly abstract and debased forms. This progression resulted from the iterative process of using cast coins as templates for new molds, where each copying step introduced wear and simplification, leading to stylized lines and reduced detail. Archaeological analyses of series like the flat-linear potins demonstrate this degeneration, with early types showing fuller relief transitioning to scribed outlines in later subgroups. Potin production lacked fixed standards for weights or diameters, resulting in coins typically ranging from 2 to 7 grams and 10 to 23 mm across, with tribal groups exhibiting variations in design sharpness attributable to mold wear during repeated use. As molds deteriorated from multiple castings, finer details blurred, producing cruder impressions in later issues, while alignment axes remained somewhat consistent at 90 or 270 degrees to facilitate paired obverse-reverse molding. These inconsistencies highlight the decentralized, workshop-based nature of potin minting across Celtic regions. Tools for design work included wooden dowels to form shallow cavities in the clay and styluses—likely made of wood or bone—for incising fine lines and details into firmer mold surfaces. Excess metal from sprues and trimmings was routinely recycled by remelting into the alloy batch, sustaining production efficiency in resource-limited settings. These methods relied on the broader techniques that enabled multiple coins to be produced simultaneously from strip molds.

Regional and Tribal Variations

Potin Coinage in Gaul

Potin coinage in was predominantly produced by Celtic tribes during the late , from approximately the until the Roman conquest around 50 BC, serving as a low-value medium for local exchange. These coins, cast from a high-tin , featured tribal-specific designs that reflected cultural symbols and were circulated primarily within Gallic territories corresponding to modern-day and . Major producing tribes included the Aulerci Eburovices, known for small horse motifs on their potins, often depicting a stylized equine figure on the reverse alongside abstract heads. The Bellovaci favored boar motifs, symbolizing strength and ferocity, with designs showing opposed boars or wolves alongside pellets and rings for added symbolism. The incorporated wolf or boar motifs on reverses with stylized heads on obverses. The Leuci produced potins with boar designs, sometimes including wheels or severed heads to evoke ritualistic themes, paired with diademed busts on the obverse. The depicted warrior figures, such as running or advancing men holding and spears, emphasizing martial prowess on coins weighing around 4-5 grams. The utilized helmeted or warrior heads on obverses with stylized horses on reverses, drawing from earlier Macedonian influences adapted to local styles. Regional variations highlighted Gaul's diverse production centers. In eastern Gaul, the Zürich-type potins featured highly abstract heads and geometric motifs like mercury's wands or stags, associated primarily with the . Central Gaul saw influences from the Greek colony of , leading to more refined abstract designs on potins that blended local Celtic elements with Mediterranean prototypes. Typical potins measured 15-20 mm in diameter and weighed 2-5 grams, though variations occurred within tribes. These coins circulated within tribal territories, facilitating intra-Gallic exchanges, as evidenced by hoards like the Zürich-Alpenquai find—a fused mass of approximately 18,000 potins weighing 59 kg, dated to around and primarily of eastern Zürich-type. Economically, potins functioned as token currency for local barter and small-scale payments among tribes, enabling everyday transactions in oppida settlements without relying on intrinsic metal value. Their production and use declined sharply during Roman campaigns in the mid-1st century BC, as imperial coinage supplanted local systems following Caesar's .

Potin Coinage in Britain

Potin coinage in Britain emerged as an insular adaptation of continental Celtic bronze minting traditions, introduced through trade networks and Belgic migrations from during the late second century BC. Primarily associated with the Cantii tribe in , these coins marked the earliest indigenous production in the region, with the neighboring Trinovantes in also issuing related types. Unlike the more varied and lighter outputs in , British potins emphasized cast techniques suited to local , featuring higher tin content. The foundational type, known as the Kentish Primary series or Thurrock potins, consisted of dumpy flans with relief designs depicting a degraded head on the obverse and a on the reverse, dating to circa 150–100 BC. These cast coins, produced in east , typically weighed 3–4 grams, reflecting a heavier than many subsequent British bronzes and allowing for use in local exchange systems. Circulation was concentrated in and , with over 400 recorded finds underscoring their role in Cantii and Trinovante economies, though fewer hoards have been discovered compared to continental examples. Gallic influences, evident in the bull motif derived from prototypes like LT 5284, arrived via cross-Channel trade. Succeeding the Kentish Primary around , the Flat Linear potin series introduced thinner and simplified linear patterns, including abstract heads and or figures, evolving through subtypes with progressively degraded designs and reduced weights averaging 1.5–2.5 grams. Issued by the same southeastern tribes, these coins maintained a focus on casting but showed technical refinements, such as stylus-engraved moulds, and circulated primarily within and the Thames estuary, with scattered finds indicating limited northward spread. By the mid-first century BC, transitional struck hybrids appeared, blending potin alloys with gold-plated elements under ongoing Belgic inspirations. Potin production in Britain declined sharply after the Roman conquest in 43 AD, as imperial coinage integrated into local systems, rendering indigenous potins obsolete by the early first century AD. The scarcity of late hoards highlights this rapid phase-out, contrasting with the prolonged use of potins in unconquered .

Iconography and Types

Common Motifs and Symbols

Potin coins, a form of Celtic bronze token currency prevalent in Gaul and Britain during the 2nd and 1st centuries BCE, feature a range of recurring motifs that reflect broader Iron Age artistic and cultural traditions. These designs often derive from earlier Greek and Macedonian prototypes but were adapted into distinctly Celtic styles, emphasizing symbolic elements tied to mythology, status, and natural forces. Animal, human, and abstract symbols dominate the iconography, serving as emblems of tribal identity, religious beliefs, and social values. Animal motifs are among the most prominent on potin coins, symbolizing vital attributes in Celtic society. Bulls frequently appear, representing strength and , as seen in examples from Kentish series where the bull's robust form underscores agricultural and . Boars embody spirit and courage, with their bristled forms on coins evoking ferocity in battle and protective qualities, such as in designs linked to tribes. Horses, denoting journey and speed, are depicted in dynamic poses, often alluding to mobility, , or divine , as in potin types showing stylized equine figures possibly inspired by equestrian deities. Human and anthropomorphic figures on coins highlight themes of and , frequently stylized to convey power. Heads, often resembling degraded Apollo-like portraits from Greek models, appear on obverses, evolving into abstract profiles that may symbolize or gods associated with and protection. Warriors adorned with —neck rings denoting elite status—feature in some designs, emphasizing and martial prowess, as evidenced by figures holding spears or shields that affirm their role as societal guardians. Abstract symbols provide a layer of cosmological significance, often simplifying complex ideas into geometric forms. Spoked wheels, interpreted as representations of the sun god or chariots, recur as emblems of celestial power and cyclical renewal, appearing alongside animals to invoke divine favor. Other elements, such as lines and blob-like patterns, represent debased versions of earlier realistic motifs, serving as filler or protective in the Celtic worldview. The of potin coins evolved markedly from the early BCE, when designs closely mimicked detailed Greek-inspired forms like heads and realistic animals, to cruder abstractions by around 50 BCE. This progression, partly due to iterative and replication processes that led to design degradation, transformed foreign archetypes into indigenous expressions of Celtic and symbolism.

Specific Tribal Examples

The Aulerci Eburovices, a Celtic tribe in northwestern , issued potin coins measuring 19×17 mm and weighing 3.1 g, characterized by a stylized on the reverse, often accompanied by pellets or rings in the field. Another variety from the same tribe features a head on the obverse, with dimensions of 15 mm and a weight of 2.1 g, exemplifying the tribe's adaptation of simplified portraiture in their token coinage. The Bellovaci, located in northeastern , produced potin coins of 17 mm diameter and 2.5 g weight, prominently displaying a boar alongside a spoked motif, reflecting localized iconographic preferences in their series classified as "class In." Among the of central , potin examples include a type measuring 18 mm and weighing 3.6 g, notable for an eye motif integrated into the obverse design, where the eye forms a central pellet within a stylized head. A related variant, 16 mm in size and 3.5 g, presents an abstract head on the obverse, with devolved features emphasizing typical of Carnutan production. The tribe in northeastern minted potin coins reaching 20 mm in and 4.7 g in , featuring a figure advancing right, holding a in one hand and often a in the other, with a braided adding to the dynamic pose. In Britain, the Cantii issued potin coins of approximately 20 mm , known as the "blob and line" type, with a degraded head on the obverse derived from earlier Apollo prototypes, showcasing the progressive stylization in southeastern British Celtic coinage. The of central created potin coins measuring 17 mm and weighing 4.1 g, distinguished by a standing on the reverse, a motif that underscores the 's use of animal in their cast series.

Archaeological and Cultural Importance

Major Discoveries

One of the most significant discoveries of potin coins occurred in 1890 at the Alpenquai site in , , where a large fused mass weighing 59.2 kilograms was unearthed from a prehistoric pile-dwelling settlement near Lake Zürich. This lump, consisting of approximately 18,000 partially melted potin coins primarily of Eastern Gaulish and local Zürich types dating to around 100 BC, was found at a depth of 1–3 meters in water, at least 50 meters from the lakeshore. The incomplete melting process suggests these coins may have been intended as cultic offerings at a nearby sanctuary. In Britain, potin coins have been recovered in scattered distributions across , with notable examples including a bull potin from 75–50 BC held in the Museums Victoria collection, featuring a stylized head of Apollo on the obverse and a butting on the reverse, influenced by central Gallic designs. These Kentish finds, often from surface scatters and excavations, reflect widespread use in the region during the late . Further east, a major hoard of about 2,000 Thurrock-type potin coins was discovered near in in 1987, containing multiple production stages and highlighting localized minting activities. More recently, in 2021, over 300 Iron Age potin coins were discovered at an HS2 construction site in , , adding to evidence of their use in southeastern Britain. In Gallic territories, tribal caches of potin coins have been identified in central , with some deposits associated with the disruptions of Julius Caesar's Gallic Wars (58–50 BC). Rare evidence of production comes from workshops, such as an intact copper-alloy obverse mold found at Romenay in eastern , demonstrating the casting techniques used for potin coinage. Archaeological analysis of fused potin masses, like those from Alpenquai, has revealed remnants of the melting process, including traces of charcoal from the ritual fires used in offerings, providing insights into ancient metallurgical and ceremonial practices.

Role in Celtic Economy and Society

Potin coins functioned primarily as low-value tokens within the Celtic economy, enabling everyday transactions such as market exchanges and the settlement of small debts in decentralized societies across Gaul and Britain. Composed of a base metal alloy, they circulated alongside higher-denomination gold and silver coins, which were reserved for elite or large-scale dealings, forming part of a tri-metallic monetary system that supported broader economic integration without centralized control. Evidence of wear on surviving examples indicates their frequent handling in routine trade, particularly in oppida and settlements from the mid-2nd century BC onward. Socially, the distinctive designs on potin coins served as markers of tribal identity, allowing communities to recognize and value from specific groups amid regional variations in production. This iconographic specificity reinforced social cohesion and distinctions among Celtic tribes, while the ' use extended to non-economic roles, including possible deposition as offerings to deities at sanctuaries. Archaeological hoards at sites, such as those in northern , underscore this ceremonial function, where coins transitioned from circulation to symbolic gifts. Culturally, potin coinage exemplifies pre-Roman in fragmented Celtic societies, adapting imported concepts to local needs and evidencing economic complexity without state oversight. The gradual devolution of artistic motifs on these coins, from intricate to simplified forms, mirrored broader pressures on and society during the late . A key limitation of potin coins was their lack of inscriptions on most issues, which provided a measure of in use compared to later named varieties and suited the fluid, tribal-based exchanges of the . Furthermore, the progressive through dilution and weight reduction signaled mounting economic in the lead-up to Roman conquest, reflecting societal strains from external influences.

References

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