 In 1986 (see below) Professor Tomás Ó Concheanainn stated his belief that much of the "Yellow Book of Lecan"/Leabhar Giolla Íosa was derived from "Leabhar Gleann Dá Locha" ("The Book of Glendalough") and "Lebor na Nuachongbála" now "The Book of Leinster".A fragment of the Yellow Book is in the hand of Solamh Ó Droma, one of the three scribes of the "Book of Ballymote".Lhuyd derived the title from a note by Ciothruadh Mac Fhirbhisigh