Guy, 1570–1606, English conspirator and leader in the Gunpowder plot of 1605: Guy Fawkes Day is observed on November 5 by the building of effigies and bonfires.
British Dictionary definitions for Fawkes
Fawkes
/fɔːks/
noun
1.
Guy. 1570–1606, English conspirator, executed for his part in the Gunpowder Plot to blow up King James I and the Houses of Parliament (1605). Effigies of him (guys) are burnt in Britain on Guy Fawkes Day (Nov 5)