Tadhg Cael Uisce Ó Briain (born , died 1259) was the eldest son of Conchobhar na Siudane Ó Briain and Tánaiste of Thomond.The Normans in Thomond, Joe Power, http://www.clarelibrary.ie/eolas/coclare/history/norman.htm
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.The History and Topography of the County of Clare by James Frost, http://www.clarelibrary.ie/eolas/coclare/history/frost/chap12_conor_na_suidaine_obrien.htm
Family He married Fionnuala, daughter of Cinnéidigh, son of Cinnéidigh, son of Muirchertach Ua Briain and had issue:John O'Hart,"Irish Pedigrees or the Origin and Stem of the Irish Nation", Volume 1, 1892, page 159, https://archive.org/stream/irishpedigreesor_01ohar#page/159 Toirdhealbhach Mór Ó Briain Domhnaill
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