Name: Diarmuid O'Duibhne/ Ui Duibhne
Father: Donn (the brown haired)
Foster Father: Aengus Mac Óg, of Brugh na Boinne
Associated Sites: Ben Bulben Tara
King: Cormac Mac Art of Tara
Army: The Fianna
Captain: Fionn Mac Cumhaill
Wife: Gráinne ní Cormaic
Sons: Donnchadh Eochaidh Ollann Connla
Daughter: One Daughter
Diarmuid O'Duibhne was one of the best warriors in the army of the Fianna. He served under Fionn Mac Cumhaill. His best known exploits can be found in the story of The Hostel of the Quicken Trees, and he is famous for his betrayal of Fionn and King Cormac Mac Art when he eloped with Cormac's daughter Gráinne after her forced marriage to Fionn in the story of Diarmuid and Gráinne. He had four sons and unfortunately met his death because he broke a geis that was placed on him by his foster father Aengus Óg never to hunt the boar.
Diarmuid had an illegitimate half-brother, an individual who became known as the Boar of Ben Bulben, whose father was Roc, a steward to Aengus Óg and Crochnuit, Diarmuid's mother. Diarmuid's father slew the boy in a rage but Roc changed the body into a boar and released it with the prophecy that it would kill Diarmuid one day which of course it inevitably did.
Stories, Myths and Legends associated with Diarmuid O'Duibhne