a child who escaped on the back of a ram with his sister Helle from a plot against them. The fleece of the ram, which he sacrificed, was the Golden Fleece.
British Dictionary definitions for Phrixus
Phrixus
/ˈfrɪksəs/
noun
1.
(Greek myth) the son of Athamas and Nephele who escaped the wrath of his father's mistress, Ino, by flying to Colchis on a winged ram with a golden fleece See also Helle, Golden Fleece