Cathal Crobhdearg Ua Conchobair

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Cathal Crobhdearg Ua Conchobair (or Cathal O'Connor, born 1153, died 1224), the youngest son of the Irish High King Tairrdelbach mac Ruaidri Ua Conchobair, was a King of Connacht.

King 1189 to 1899, and 1202 to 1224, he first suceeded his oldest brother Ruadrai's son Conchobar Máenmaige as ruler of Connacht. Conchobar Máenmaige's son Cathal Carrach then ruled from 1199 to 1202, with Cathal Crobhdearg back in power from then. From his base west of Shannon River he was forced to deal with the Norman invaders. Competent leader despite problems, avoided major conflicts winning minor skirmishes. Ua Conchobair attempted to make the best of the new situation with Ireland divided between Norman and Gaelic rulers. Long reign perhaps a sign of relative success. He had succeeded Rory O'Connor previously High King. Object of poem Cathal Mór of the Wine Red Hand.

He founded Ballintubber Abbey in 1215, and was succeeded by his son, Aedh mac Cathal Crobhdearg Ua Conchobair.