Custennin son of Mnwyedig (also called Custennin the Shepherd [custenin heussaỽr]) in the story of Culhwch and Olwen is a shepherd, seemingly of gigantic size. His wife is a daughter of Amlawdd Guletic and so she is sister to both Arthur’s mother Eigyr and Culhwch’s mother Goleuddyd. By her, Custennin is the father of twenty-four sons, all but the youngest of whom has been slain by Ysbaddaden Chief Giant. This youngest was preserved mainly by being hidden in a chest.