Táin Bó Flidhais, also known as the Mayo Táin, is a tale from the Ulster Cycle of early Irish literature. It is one of a group of works known as Táin Bó, or "cattle raid" stories, the best known of which is Táin Bó Cúailnge. Táin Bó Flidhais survives in two forms, a short version from the Old Irish period and a longer, wordier version found in the 15th century Glenmasan Manuscript which is held in the Advocates Library in Edinburgh. It is believed to be a copy of an earlier manuscript from the 12th century. The early version of Táin Bó Flidhais predates the Táin Bó Cúailnge. It is named for the heroine of the tale, Flidais.