Muirchertach Ua Briain [SEP] father
Muirchertach Ua Briain
Muircheartach Ua Briain (old spelling: Muirchertach Ua Briain) (also known as Murtough O'Brien) (c. 1050 – c. 10 March 1119), son of Toirdelbach Ua Briain and great-grandson of Brian Bóruma, was King of Munster and later self-declared High King of Ireland.
Background.
Muirchertach Ó Briain was a son of Toirdelbach Ua Briain, the previous Dalcassian king Munster and de facto high king of Ireland. His mother was Derbforgaill, daughter of Tadhg Mac Giolla Pádraig of Osraige
Tadhg Cael Uisce Ó Briain
Tadhg Cael Uisce Ó Briain (died 1259) was the eldest son of Conchobhar na Siudane Ó Briain and Tánaiste of Thomond.
Life.
He received the suffix "Cael Uisce" from the having attended the conference of Cael Uisce on behalf of his father and refusing to acknowledge Brian Ua Néill as High King. He died in 1259, pre-deceasing his father. 
Family.
He married Fionnuala, daughter of Cinnéidigh, son of Cinnéidigh, son of Muirchertach Ua Briain and