Donn Cothaid mac Cathail

Donn Cothaid mac Cathail, King of Connacht, died 773.

Donn Cothaid was a King of Connacht from the Ui Fiachrach Muaidhe branch of the Connachta. He was the great-grandson of Dúnchad Muirisci mac Tipraite (died 683). He was the last member of this branch to hold the throne of Connacht and ruled from 768 to 773.

Descendants
Donn Cothaid's son, Connmhach mac Duinn Cothaid (died 787), was a later king of the Ui Fiachrach. A grandson, Dubda mac Conmac, was the grandfather of Aed Ua Dubhda, eponym and ancestor of the O'Dowd Chiefs of the Name.