Mór Ní Briain was Queen of Connacht, and died 1218. She was a daughter of King Domnall Mór Ua Briain of Thomond (died 1194). Domnall's wife was , Princess of Leinster, daughter of Queen Mor Ui Thuathail and King Diarmaid Mac Murchadha of Leinster. Mór's siblings included: * Muirchertach Finn, King of Thomond 1194-1198 and 1202/1203-1208/1210, died 1239. * Conchobar Ruadh, King of Thomond 1198-1202/1203, killed 1202/1203. * Donnchadh Cairprech, King of Thomond 1208/1210–1242. * an unnamed daughter who is said to have married William de Burgh.