Cacht ingen Ragnaill was the queen of Donnchad mac Briain, from their marriage in 1032 [1] to her death in 1054, when she is styled Queen of Ireland in the Irish annals of the Clonmacnoise group: the Annals of Tigernach and Chronicon Scotorum.
That her style is superior to his presents an obviously strange situation in medieval Gaelic Ireland's male-dominated politics.
Of Norse-Irish descent, Cacht almost certainly belonged to the dynasty of the Uí Ímair, and is usually assumed to have been a sister of Donnchad's ally Echmarcach mac Ragnaill, whose precise parentage is uncertain.
He is regarded by scholars either as a descendant of Ivar of Waterford,[4] or of Gofraid mac Arailt,[5] but since both had children named Ragnall and both dynasties were in alliance with the Dál Cais, Cacht's father need not be identical with his.
This biography of a member of an Irish royal house is a stub.