the Book of Leinster

Book of Leinster, the, one of the great 12th-cent. manuscript collections, compiled under the patronage of Diarmuid mac Murchada (Mac Murrough; see Norman invasion) and formerly known as Lebor na Nuachongbála after Nuachongbáil, now Oughaval, Co. Laois. R. I. Best believed that the manuscript was the work of a single scribe, whom he identified as Aed ua [mac] Crimthainn of Terryglas, Co. Tipperary. A treasury of medieval Irish learning, it contains Lebor Gabála, Táin Bó Cuailnge, parts of Dinnshenchas Érenn, an account of the banqueting hall (Tech Midchuarta) at Tara, and a list of the 350 tales [see tale-types] a poet should know. The book is mostly preserved at TCD.