sentences:  Jean II was succeeded by his brother Lucien I.Peace did not reign in Monaco for long; in December 1506 14,000 Genoese troops besieged Monaco and its castle, and for five months 1,500 Monégasques and mercenaries defended the Rocher before achieving victory in March 1507.This left Lucien I to walk a diplomatic tightrope between France and Spain in order to preserve the fragile independence of the tiny state which was in truth subject to Spain.