E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Ferrex and Porrex.
Two sons of Gorboduc, a mythical British king. Porrex drove his brother from Britain, and when Ferrex returned with an army he was slain, but Porrex was shortly after put to death by his mother. One of the first, if not the very first, historical play in the English language was Ferrex and Porrex, by Thomas Norton and Thomas Sackville.