E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The code of Dunvallo Mulmutius, sixteenth King of the Britons (about B.C. 400). This code was translated by Gildas from British into Latin, and by Alfred into Anglo-Saxon. These laws obtained in England till the Conquest. (Holinshed: History of England, iii. 1.).
Mulmutius made our laws,
Who was the first of Britain which did put
His brows within a golden crown, and called
Himself a king.
Shakespeare: Cymbeline, iii. 1.
Mulmutius was the son of Cloten, King of Cornwall. (See Geoffrey of Monmouth, British History, ii. 17.)