[1] Lecan was the site of the Mac Fhirbhisigh school of poetry in the territory of Tír Fhíacrach Múaidhe, now Lackan in Kilglass parish, County Sligo (54°14′31″N 9°04′19″W / 54.242°N 9.072°W / 54.242; -9.072).
[n 1] This incomplete Táin Bó Cúailnge overlaps with the partial version given in the Book of the Dun Cow; the complete text known today was derived from the combination of these recensions.
It contains a story of the life of Saint Patrick as told by Fintan mac Bóchra that contains the account of Trefuilngid Tre-eochair, a giant at the Hill of Tara who is first to hear about the crucifixion of Jesus Christ.
Ó Muraíle further states: "That is one index of Giolla Íosa Mac Fir Bhisigh's importance; to his scribal labours we owe the preservation of the most celebrated of medieval Irish tales, Táin Bó Cúailnge."
Lhuyd derived the title from a note by Ciothruadh Mac Fhirbhisigh: [Leab]ar an Buide Leacain anim an leabhair so; mise Cirruaidh mac Taidg Ruaidh The Yellow Book of Lecan is the name of this book; I am Ciothruagh son of Taidg Ruaidh The numbering for the texts given below is both by column (as in the manuscript) and by number of pagination (as in the facsimile edition).
[n 3] 1. how Finn mac Cumaill made peace between Glangressach, chief ollam of the Meic Miled, and Sodelb, daughter of Cormac;[6] 2.