Tommaltach Ua Conchobair, bishop of Elphin and archbishop of Armagh, lived from c. 1150–1201.
Tommaltach was nephew to Ruaidhri, King of Ireland (reigned 1156–1183) and King Cathal of Connacht, (reigned 1202–1224); first cousin to Rose, wife of Hugh de Lacy, Lord of Meath (died 1186), and associate of archbishop of Dublin, Lorcan Ua Tuathail (died 1180).
He appears to have maintained good relations with Hugh de Lacy, Lord of Meath, and King John during the latter's visit to Ireland in 1185.
Later he was assisted by de Courcy in commissioning a life of Saint Patrick to advance Armagh's claim to the primacy of Ireland, against that of Dublin.
At the 1192 Synod of Dublin, he successfully regained for Armagh control of the diocese of Louth, which had been claimed by King Donnchadh Ua Cearbaill of Airgialla in the 1150s.