Codex Basilensis A. N. IV. 2

Codex Basilensis A. N. IV. 2 is a Greek minuscule manuscript of the entire New Testament, apart from the Book of Revelation. It is designated by the siglum 1 in the Gregory-Aland numbering of New Testament manuscripts, and δ 254 in von Soden's numbering of New Testament manuscripts, and formerly designated by 1^eap to distinguish it from minuscule 1^rK (which previously used number 1). Using the study of comparative writings styles (palaeography), it is usually dated to the 12th century CE.

The manuscript was prepared for liturgical use with marginalia (text division), and has almost completely survived; Erasmus used it for his Novum Instrumentum omne (an edition of the Greek New Testament). The text of the manuscript has been cited in all critical editions of the Greek New Testament; in this codex, the text of the Gospels is more highly esteemed by scholars than that of the remaining New Testament books. The codex is housed at the Basel University Library, with shelf number A. N. IV, 2 (earlier B. VI. 27).

The manuscript is a codex (precursor to the modern book) made of 297 parchment leaves (18.5 cm by 11.5 cm), containing the entire New Testament (except of Book of Revelation) in the following order: the Gospels, the Acts of the Apostles, the General epistles, and the Pauline epistles (Hebrews is the last book in Paul). The text is written in one column per page, 38 lines per page. It was originally accompanied by miniatures, which were stolen before 1860–1862 (except one before the Gospel of John, which remains).

The dimensions of the text are 13.6 cm by 6.8 cm. It was written on parchment continuously and without separation in elegant minuscule, furnished with breathings (spiritus asper, spiritus lenis), accents, and Iota adscript. The initial letters are gilt, and on the first page of each Gospel the full stop is a large gilt ball.

The text is divided according to chapters (known as κεφαλαια / kephalaia) whose numbers are given in the margin, with their titles (known as τιτλοι / titloi) at the top of the pages. The text of the Gospels is divided according to the smaller Ammonian Sections (in Matthew 352, in Mark 236 with last numbered section in 16:12, in Luke 340, in John 227), but references to the Eusebian Canons are absent. The Book of Acts and the epistles have the Euthalian Apparatus.

It contains prolegomena, synaxaria (a list of saints), two types of lectionary markings in the margin (for liturgical reading), and pictures (e.g. a portrait of John the Evangelist and Prochorus). The later type of liturgical notes, so called αναγνωσεις (only for Gospels), were added by a later hand (in red). There are 116 αναγνωσεις in the Gospel of Matthew, 70 in the Gospel of Mark, 114 in the Gospel of Luke, and 67 in the Gospel of John. In the 15th century, the later hand added Prolegomena.

The codex contains a scholion questioning the authenticity of Mark 16:9-20. The Pericope Adulterae (John 7:53-8:11) is placed after John 21:25.

In Aland's Profile, biblical scholars Kurt and Barbara Aland placed the codex's Gospels in Category III, meaning it has historical importance, with the profile of 119¹, 80², 60^1/2, 69^s. This means the text of the codex agrees with the Byzantine standard text 119 times, with the original text against the Byzantine 80 times, and with both the Byzantine and original text 60 times. There are 69 independent or distinctive readings in the Gospels. While the Gospels in codex 1 are considered a representative of the Caesarean text-type, the remainder of the books of the New Testament are considered a representative of the Byzantine text-type and falls into Category V, the lowest and least important in Aland's Profile.