Tuathal Ua Connachtaig (known in Latin as Thaddaeus)'Monasticum Hibernicum; or, an history of the abbeys, priories, and other religious houses in Ireland' Mervyn Archdall (Irish antiquary)|Archdall, M. (Dublin: printed for Luke White, 1786) was an Irish bishop in the 12th century.“A New History of Ireland” T. W. Moody, F. X. Martin, F.J. Byrne and Cosgrove, A: Oxford, OUP, 1976
He was present at the Synod of Kells in March 1152. He took the oath of fealty to Henry II in 1172 as Bishop of Kells, but is more often recorded as Breifne."Medieval Ireland: An Encyclopedia" Seán Duffy, S/ MacShamhráin, A/ Moynes, J: Abingdon, Routledge, 2005
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