Fenian cycle

 fen'-ee-uhn

  The Fenian cycle is a body of early Irish heroic tales
centering on the exploits of Finn McCool and the Fianna, bands
of warriors known as Fenians. Other characters include Finn's
son Ossian, Ossian's son Oscar, and Diarmuid and Grania, young
lovers who are pursued by Finn, Grania's fiance. Diarmuid,
Grania, and Finn are analogous to another famous trio, Tristan,
Isolde, and King Marc of the Arthurian legends. DAVID H. GREENE