François Grimaldi

From Freepedia

François Grimaldi (François Malizia - "the Cunning") was the leader of the Guelphs who captured the Rock of Monaco on the night of January 8, 1297. Dressed as a Franciscan monk, François was greeted at the gates of Monaco's castle, only then to seize the castle with a group of men behind him; the event is commemorated on the Monegasque coat of arms, where the supporters are two monks armed with swords.

His descendants, the Grimaldi family, still rule Monaco today, with Prince Albert II the head of the House of Grimaldi.