Diarmait Ó Conchobair was Prince of a province in what country?
Diarmait Ó Conchobair Diarmait mac Ruaidrí Ó Conchobair, Prince of Connacht, died 1221.
Cerball mac Muirecáin Cerball mac Muirecáin (died 909) was king of Leinster. He was the son of Muirecán mac Diarmata and a member of the Uí Fáeláin, the descendants of Fáelán mac Murchado (died 738), of one of three septs of the Uí Dúnlainge of modern County Kildare in Ireland.