Methoni occupies a low promontory on the southwestern Peloponnese, with a sheltered harbor on routes linking the Adriatic, Ionian, and eastern Mediterranean seas. Ancient settlement and Byzantine defenses preceded the medieval fortress. Venice secured Methoni in the early thirteenth century and made it, together with Koroni, a principal station for ships traveling to Crete and the Levant. The republic strengthened the landward walls and harbor defenses while developing a fortified town of houses, churches, warehouses, offices, and military quarters.

Venetian merchants, pilgrims, diplomats, and soldiers passed through Methoni, which offered supplies and protection on long voyages. The fortress and Koroni were called the “eyes” of Venice because they watched critical sea lanes. Massive walls, a deep ditch, gates, towers, and waterfront defenses were repeatedly repaired as artillery changed siege warfare. The enclosure depended on the surrounding countryside and maritime trade for food, labor, and revenue, while its mixed population experienced both the opportunities and the hazards of life in an exposed overseas colony.

Ottoman Sultan Bayezid II captured Methoni in 1500 after a major siege, ending nearly three centuries of Venetian rule. The conquest brought severe loss of life and displacement, followed by changes in administration, worship, settlement, and garrison organization. Ottoman builders reused and altered Venetian works. The small fortified islet at the end of the causeway, known as the Bourtzi, took its mature form within this evolving defensive system. Methoni remained valuable as a harbor even as shifting naval routes and technologies changed its wider strategic importance.

Venice recovered the fortress in 1686 during the Morean War but lost it again to the Ottomans in 1715. During the Greek War of Independence, control of coastal strongholds remained difficult, and Methoni served Ottoman-Egyptian forces. In 1828 French troops of the Morea Expedition took possession as those forces withdrew, helping secure the area for the new Greek state. French engineers also contributed to works in the town and to the long bridge that crosses the landward ditch.

After its military role ended, much of the settlement inside the walls disappeared, leaving an unusually broad open enclosure marked by foundations, religious buildings, gates, and scattered architectural fragments. Conservation now addresses coastal erosion, earthquakes, vegetation, and the structural legacy of repeated rebuilding. Methoni Castle is best understood as a fortified port rather than a single palace. Its history joins ancient geography, Venetian maritime empire, Ottoman conquest, renewed Venetian rule, Greek independence, and modern archaeology in a landscape where the harbor and sea walls remain as important as the towers.