E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Uterine brother of Prince Arthur. Spenser, in his Faërie Queene (book iii.), makes Britomart see his person and name in the magic glass. She falls in love with the looking-glass hero, and is told by Merlin that she will marry him, and become the mother of a line of kings that would supersede both the Saxons and Normans. He referred, of course, to the Tudors, who were descendants of Cadwallader. (See ARTEGAL.)