Castle, Second Gate, Facade

Acrocorinth (Upper Corinth), the acropolis of ancient Corinth, is a monolithic rock overlooking the ancient city of Corinth, Greece. Acrocorinth was continuously occupied from archaic times to the early 19th century. The city's archaic acropolis, a defensible position due to its geomorphology, was heavily fortified during the Byzantine Empire as it became the seat of the strategos of the thema of Hellas and later of the Peloponnese. It was defended against the Crusaders invasion circa 1198 – 1208. Later, it became a fortress of the Frankish Principality of Achaea, the Venetians and the Ottoman Turks. It had a secure water supply and was the last line of defense of southern Greece, commanding the Isthmus of Corinth, preventing invaders from entering the Peloponnese peninsula.