 The version that survived in Ireland was contained within a manuscript called "The Book of Armagh" (Dublin, Trinity College, Ms.52), which contains most important later traditions about Patrick and dates from the second half of the seventh century.The biography about Saint Patrick written by Muirchú is just one of many documents relating to Saint Patrick contained within this book.The manuscript was copied in the year 807, shortly after the "Vita Patricii" was written, and is likely the most authentic version.