Fortified City of Rhodes

Timeline

1. 1309–1380Old Town of Rhodes · RhodesAfter taking over, the order systematically rebuilt on the base of the former Byzantine city. The north was designated the knights' quarter (Collachium), including the Palace of the Grand Master, the Church of St. John, and the inns of the various national 'tongues' along the Street of the Knights; the south was designated the citizens' quarter (Burgo), inhabited by Greek, Italian, Jewish, and Syrian merchants. The order repaired the harbor defenses, installed chain barriers at the entrances of Mandraki Harbor and Commercial Harbor, and introduced Catalan-style stone-throwing artillery emplacements. The city gradually became an important transshipment port in the eastern Mediterranean and a military base from which Christians pressured Muslim shipping.
2. c. 1380–1480Knights' quarter, Old Town of Rhodes · RhodesFrom the late 14th to the 15th century, the Palace of the Grand Master was expanded and completed in Gothic style using Corinthian limestone, becoming the symbol of the order's rule and its administrative center. Along the Street of the Knights (Rue des Chevaliers) stood the inns of eight 'tongues'—France, Spain, Italy, England, Germany, Provence, Auvergne, and Castile—each decorating its lintel with its national coat of arms, preserved intact to this day. The wall system at this time was still dominated by vertical high walls and had not yet been fundamentally reformed for gunpowder artillery.
3. 1481–1510Old Town of Rhodes walls and moat system · RhodesThe Ottoman siege of 1480 exposed the vulnerability of traditional high walls to bombardment. Grand Master Pierre d'Aubusson commissioned Italian military architects to redesign the defense system: low, thick bastions were added outside the old walls, with sloped faces to absorb cannonball impact; the moat was widened and paved with broad cavaliers for artillery carriages; and gun platforms were set at key corner points. Grand Master Emery d'Amboise (1503–1512) hired experts, including engineers possibly from Leonardo da Vinci's school, driving a comprehensive renovation blending Italian Renaissance fortress theory (an early form of the trace italienne).
4. 1511–1520Western and southern stretches of the Old Town walls, Rhodes · RhodesThe succeeding Grand Master Fabrizio del Carretto, from 1513, directed the most intensive construction works of 1511–1521. The Bastion of Spain was greatly expanded at the southwest corner with added double-tier gun positions; the Bastion of Italy was raised into the main battery covering the inner harbor; the Bastion of England was reinforced on the northern stretch with new revetments. The southern section of the moat was dug to about 12 m deep and 30 m wide, with rubble paving laid at the bottom to counter mining. The entire defense formed a multi-layered in-depth system of outer ditch, main wall, inner galleries, and corner towers; the Ottoman siege of 1522 stalled against this very system for six months.
5. 1522Old Town of Rhodes · RhodesAfter the Ottoman occupation in December 1522, Suleiman I stabilized the city with a policy of religious tolerance: the Church of St. John was converted into a mosque, and the Palace of the Grand Master was retained as an administrative building. The residences of the knights' quarter were gradually occupied by Ottoman notables and townspeople, while the original urban layout was largely maintained. During the Italian occupation of the 20th century (1912–1943) the Palace of the Grand Master was partially reconstructed (its interior decoration is a restorative reconstruction). In 1988 the Old Town of Rhodes was inscribed on the UNESCO World Heritage List as a 'Medieval City of the Mediterranean', the highest recognition of the order's more than two centuries of building legacy.