Knights Hospitaller Fortresses

Timeline

1. c. 1100–1291Acre · PalestineThe Order built concentric castles at Acre, Margat, and elsewhere, integrating hospital functions with defensive systems to support the coastal defenses of the Crusader states.
2. c. 1261–1270Cyprus · CyprusAfter Crusader territory shrank, the Order temporarily headquartered in Cyprus, fortified coastal strongholds, and maintained naval supply and military support for remaining Levantine outposts.
3. 1309–1523Rhodes · RhodesAfter capturing Rhodes in 1309, the Order built the Grand Master's Palace and a chain of coastal watchtowers, forming an island-chain defense network against the Ottoman navy; the Order became known as the Knights of Rhodes.
4. c. 1400–1500Rhodes · RhodesFacing Ottoman expansion, the Order reinforced the walls of Rhodes Town in the 15th century, added artillery bastions and harbor defenses, completing the final round of strengthening of the medieval fortress system under the threat of cannon.