E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Mau’gys.
A giant who keeps a bridge leading to a castle by a riverside, in which a beautiful lady is besieged. Sir Lybius, one of Arthur’s knights, does battle with the giant; the contest lasts a whole summer’s day, but terminates with the death of the giant and liberation of the lady. (Libeaux, a romance.)
