Initiated in the 12th century and completed in the 17th century, Fort Saint-Jean, which marks the entrance to the Vieux-Port (Old Port) of Marseille, first served as a departure point towards the Holy Land for the Commandery of the Hospitallers of Jerusalem. They orchestrated the addition of a church, a hospital, and the Commander's Palace. The defense of the fort was improved in the 15th century by the construction of the Tour du Roi René or Tour Carrée (Square Tower) and in the 17th century by that of the Tour du Fanal or Tour Ronde (Round Tower). Citadels were erected by Louis XIV at the same time following the rebellion of the Marseillais against the royal power. Since 2013, Fort Saint-Jean has been an integral part of the MuCEM (Musée des Civilisations de l'Europe et de la Méditerranée) to which it is connected by a 426 ft (130 m) footbridge (left).