
1) British traditional history 2) English boy name 3) Mythological prince
Found on
https://www.crosswordclues.com/clue/ferrex

Ferrex was the son of the legendary king Gorboduc of the Britons, and fought with his brother Porrex for the throne, according to Geoffrey of Monmouth. When his father had become old, he quarrelled with his brother Porrex over who would succeed to the kingship. Ferrex discovered that Porrex planned to kill him, and fled to Gaul, where he enlisted ...
Found on
http://en.wikipedia.org/wiki/Ferrex
No exact match found.