E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Marsiglio or Marsilius.
A Saracen king who plotted the attack upon Roland, under the tree on which Judas hanged himself. With a force of 600,000 men, divided into three armies, he attacked the paladin and overthrew him, but was in turn overthrown by Charlemagne, and hanged on the very tree beneath which he had arranged the attack. (Turpin: Chronicles.)