Bé Binn inion Urchadh ( Beibhinn) Princess of the Uí Briúin Seóla and Queen of Thomond, fl. early 10th century. Bé Binn was a daughter of King Urchadh mac Murchadh of Maigh Seóla (reigned 891?-943). She was married to King Cennétig mac Lorcáin of Thomond (died 951). Cennétig is known to have had as many as eleven sons and at least one daughter, Órlaith íngen Cennétig (Queen of Ireland, died 941). The only child positively assigned to her by Cennétig - who had a number of wives - was High King of Ireland, Brian Boru (c. 941–23 April 1014). This makes Bé Binn ancestor to all subsequent Dál gCais O'Briens and their offshoots.