Goll mac Morna (or Goal mac Morn) was a member of the fianna and an uneasy ally of Fionn mac Cumhail in the Fenian Cycle of Irish mythology. He had killed Fionn's father, Cumhal, and taken over the leadership of the fianna, but when Fionn grew up and proved his worth Goll willingly stepped aside in his favour. In Irish mythology, the Fianna were Irish warriors who served the High King of Ireland in the 3rd century AD. Their adventures were recorded in the Fenian Cycle. ... Fionn mac Cumhail was a legendary warrior of Irish mythology. ... The Fenian Cycle also known as the Fionn Cycle, Finn Cycle, Fianna Cycle, Finnian Tales, Fian Tales, Féinne Cycle, Feinné Cycle, Ossianic Cycle and Fianaigecht, is a body of prose and verse centering on the exploits of the mythic hero Fionn mac Cumhaill and his warriors the Fianna Éireann. ... Although many of the manuscripts containing texts relating to Irish mythology have failed to survive, and much more material was probably never committed to writing, there is enough remaining to enable the identification of four distinct, if overlapping, cycles: the Mythological Cycle, The Ulster Cycle, the Fenian Cycle and the...

His given name was Áed. He gained the name Goll ("one-eyed") when he lost an eye in his battle with Cumhal.