Background
Domnall"s wife was Órlaith Ní Murchadha, Princess of Leinster, daughter of Queen Mor Ui Thuathail and King Diarmaid Mac Murchadha of Leinster.
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Domnall Mor Ua Briain
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Mor Ní Briain was Queen of Connacht, and died 1218. 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.
Relatives included Archbishop Lorcán Ua Tuathail, Cormac mac Art O Melaghlain, Brian Ua Néill, Ruadhri Ua Flaithbertaigh, and William Marshal, 2nd Earl of Pembroke. Her ancestors included High King of Ireland Brian Boru (died 1014), King Énnae Cennsalach of Leinster (fl 5th century), Bé Binn inion Urchadh of Maigh Seóla (fl early 10th century) and Gormflaith ingen Murchada.
Other ancestors may have included Sigtrygg Silkbeard, Ingjald Helgasson and Ragnar Lodbrok. Mór married Cathal Crobdearg Ua Conchobair, who ruled as King of Connacht in opposition (1189–1202) and solely (1202-1224).
The marriage was unusual as she was Cathal"s only wife.
In contrast, most Gaelic rulers had a number of wives at the same time. The senior line of the family, O"Conor Don - who survives to this day - descend from her.
