Comhaltan Ua Cleirigh
Mac Comhaltan Ua Cleirigh,  King of Uí Fiachrach Aidhne, fl. 964. Mac Comhaltan was an early member of the Ó Cléirigh family. According to the Annals of the Four Masters, sub anno 964:

A victory was gained by Comhaltan Ua Cleirigh, i.e. lord of Ui-Fiachrach-Aidhne, and by Maelseachlainn, son of Arcda, over Fearghal Ua Ruairc, where seven hundred were lost, together with Toichleach Ua Gadhra, lord of South Luighne. He may have been a brother of Eoghan Ua Cleirigh, Bishop of Connaught, who died in 967. A close relative was Giolla Ceallaigh mac Comhaltan, from whom descend the family of Kilkelly. References

 Irish Kings and High-Kings, Francis John Byrne (2001), Dublin: Four Courts Press, 
 CELT: Corpus of Electronic Texts at University College Cork

Nobility from County Galway
10th-century Irish monarchs