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http://en.wikipedia.org/wiki/Cennétig_mac_LorcainCennétig was king of the
Dál gCais, one of the tribes of the
Déisi, subject peoples in
Munster. Their name was new, first recorded in the 930s, and they had previously been an undistinguished part of the northern Déisi. The
kings of Munster at this time came from the
Eóganachta, a vast, complex group of kindreds who claimed descent from
Eógan Már. The learned men of the Dál gCais provided a new, and improved, genealogy for their kings, tracing their descent from Eógan Már's brother Cormac Cass.
The Dál gCais were based in eastern
County Clare, part of the region known as
Tuadmumu , a name which first appears in 944 in the report of the defeat of Cennétig at Gort Rotacháin by the Eóganachta king
Cellachán Caisil.