Fergus mac Róich
This book outlines the history and genealogical ramifications of the descendants of Íor son of Míl Espáine, known as the "Síol Ír". The material was derived from "Leabhar Uí Dubhagáin" (aka Leabhar Ua Maine). This section is followed by a shorter one treating of the Dál nAraidi and the descendants of Fergus mac Róich. It ends with a version of "Clann Ollamhan Uaisle Eamhna", similar to, though not exactly, the one found in Leabhar Ua Maine.