In reply, European navies and especially the French Navy and the Knights Hospitaller (self-proclaimed descendants of the Crusaders) laid siege to the city and occasionally captured it for limited periods of time. For a century in the 1600s and for a brief period in the 1700s the city either was under Spanish or Hospitallar control. During this period a number of palaces were built, but the overwhelming edifice of Hayreddin Barbarossa's citadel, was considered too militarily valuable to destroy and uncover the previous ancient buildings of old Caesarea.