Mac Cécht first appears in the tale Togail Bruidne Dá Derga ("The Destruction of Da Derga's Hostel") as the bodyguard of the High King Conaire Mor along with the Ulster hero Conall Cernach.
Mac Cécht's role in the tale is recalled in a dindsenchas prose text on Ráith Cnámrossa, which gives his father's name in garbled form as Slaite Seched of Connacht [REF].