Donnchad mac Briain

Donnchad mac Briain (died 1064) was a son of Brian Boru and a Leinster king's daughter. He survived the Battle of Clontarf in 1014, where his father and half-brother Murchad were killed, and made himself king of Munster; his rival half-brother Tadc was assassinated in 1023, reportedly on his order.

He later fought Diarmait of Leinster and his nephew Toirdelbach Ua Briain, who in 1058 helped drive him from Limerick. Deposed in 1063, he went on pilgrimage to Rome, died in 1064, and was buried at Santo Stefano al Monte Celio.