Tadc mac Céin, in medieval Irish historical tradition, was the grandson of Ailill Aulom and Sadb, daughter of Conn Cetcathach.
[1] These peoples were settled, in the Middle Ages, in the Midland kingdoms of Brega and Mide, Connacht, and western Ulster.
[2] According to saga and genealogical tradition, Tadc established himself in the Midlands of Ireland after being granted territory by Cormac mac Airt, the king of Ireland (and Tadc's first cousin once removed, via Sadb), in exchange for his decisive assistance at the Battle of Crinna, against Fergus Dubdétach, king of the Ulaid.
[6] As Mac an Bhaird argues, this implies that this was still how his name was understood, as traditional taboos against eating one's namesake are well-attested internationally.
[7] The hero Cú Chulainn ("Culann's Hound") had a similar taboo against eating dog-meat.