| Book of Armagh | |
|---|---|
| Codex Ardmachanus | |
 A page of text from the Book of Armagh. | |
| Also known as | Liber Ar(d)machanus (Book of Armagh), Canoin Phatraic (Canon of Patrick) |
| Ascribed to | Ferdomnach of Armagh, St Patrick, Sulpicius Severus and others |
| Language | Latin, Old Irish |
| Date | 9th century |
| State of existence | Incomplete |
| Manuscript(s) | TCD MS 52 |
| Length | 222 folios (folios 1 and 41-44 are missing) |
The Book of Armagh or Codex Ardmachanus (ar or 61) (Irish: Leabhar Ard Mhacha), also known as the Canon of Patrick and the Liber Ar(d)machanus, is a 9th-century Irish illuminated manuscript written mainly in Latin. It is held by the Library of Trinity College Dublin (MS 52). The document is valuable for containing early texts relating to St Patrick and some of the oldest surviving specimens of Old Irish, and for being one of the earliest manuscripts produced by an insular church to contain a near complete copy of the New Testament.[1]