Cenél Coirpri

Tethbae (pronounced [ˈteθve]; also spelled Tethba, often anglicised Teffia) was a confederation of túaithe in central Ireland in the Middle Ages. It was divided into two distinct kingdoms, north Tethba, ruled by the Cenél Coirpri, and south Tethba, ruled by the Cenél Maini. It covered parts of County Westmeath and much of County Longford, counties which today are the far north-west part of the province of Leinster. In some cases Tethbae may refer to south Tethbae only.

In Early Christian times, Tethba lay within the lands of the southern Uí Néill and the ruling dynasties of both kingdoms were reckoned members of the Uí Néill kindred in medieval genealogies. North Tethba—Tethbae Thúaiscirt—was centred on Granard, while south Tethba—Tethbae Deiscirt—lay around Ardagh.

The division of Tethbae into northern and southern regions was attested in the 7th century. It was not only a political and dynastic division. The chief churches of the two-halves belonged to different church confederations. North Tethbae's principal church at Granard was associated with Saint Patrick from the earliest written records. Bishop Tirechán's hagiography refers to "the two Tethbae" and claims that Patrick established bishops at both Granard and Ardagh. But although Granard is included among the network of Patrician churches, Ardagh is not. The key figure in Ardagh tradition was its founder, Bishop Mél, according to Patrician accounts a nephew of Patrick. Ardagh, by the time of Tirechán and the earliest records, was a part of the confederation of churches which took Brigit of Kildare as chief patron and looked mainly to the church at Kildare for leadership.

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