Ruaidhrí mac Coscraigh was King of South Connacht and of Uí Briúin and a fourth great-grandson of the eponym of Clann Cosgraigh. Ruaidhri is mentioned in the Annals of Inisfallen[1] and Tigernach[2] as well as the Leabhar na nGenealach.[3]
Ruaidhrí was slain fighting Conchobar mac Mael Sechnaill, King of Corcu Modruad and Mac Comhaltan Ua Cleirigh of the Uí Fiachrach Aidhne in 993.[4]