Goreu fab Custennin

He is a significant character in the Middle Welsh Arthurian tale Culhwch and Olwen, and also appears in a number of other medieval texts.

"[1] While on the quest to locate the stronghold of Ysbaddaden Bencawr, Culhwch ap Cilydd and his six companions come across a shepherd and his flock.

In a bid to save their youngest son from suffering the same fate, the shepherd and his wife hide him away in a chest.

Cai, one of Arthur's foremost knights, offers to take the boy with him on the quest for Olwen, promising to fight to the death to protect him.

The Welsh Triads refer to a tradition in which Goreu rescued Arthur from three enchanted otherworldy prisons.