The citadel of Saint-Tropez constitutes one of the links in the chain of coastal fortifications set up by Raymond de Bonnefons, the military engineer for King Henry IV on the Mediterranean shore. He endeavored in strengthening and modernizing the fortifications of several sites between Antibes and Martigues. The enclosure protecting Antibes with four bastions was built between 1602 and 1608. The work for the central tower of Saint-Tropez's citadel lasted from 1602 to 1607, while Toulon's five-bastion wall was completed in 1600. Fortification works were also undertaken on the Marseilles islands of the castle of If, Pomègues, and Ratonneau, and a bastioned enclosure was created around the Fort de Bouc located on the eponymous islet.