In which resort is the Castle of St Peter, built by the Knights Hospitaller in the 15th century?

Bodrum Castle located in southwest Turkey in the port city of Bodrum was built from 1402 onwards, by the Knights of St John as the Castle of St. Peter or Petronium.

Confronted with an invasion by the Seljuk Turks, the Knights Hospitaller, whose headquarters were on the island of Rhodes, needed another stronghold on the mainland. Grand Master Philibert de Naillac (1396–1421) identified a suitable site across from the island of Kos, where a castle had already been built of the Order. Its location was the site of a fortification in Doric times (1110 BC) as well as of a small Seljuk castle in the 11th century. The same promontory is also the probable site of the Palace of Mausolos, the famous King of Caria.

The construction of the castle began in 1404 under the supervision of the German knight-architect Heinrich Schlegelholt. Construction workers were guaranteed a reservation in heaven by a Papal Decree of 1409. They used squared green volcanic stone, marble columns and reliefs from the nearby Mausoleum of Maussollos to fortify the castle.