Monemvasia is a town and a municipality in Laconia, Greece. The town is located on a small island off the east coast of the Peloponnese. The island is linked to the mainland by a short causeway 200m in length.
Its area consists mostly of a large plateau some 100 metres above sea level, up to 300 m wide and 1 km long, the site of a powerful medieval fortress. The town walls and many Byzantine churches remain from the medieval period. Today, the seat of the municipality is the town Molaoi.
The town and fortress were founded in 583 by inhabitants of the mainland seeking refuge from the Slavic and the Avaric invasion of Greece. A history of the invasion and occupation of the Peloponnese was recorded in the medieval Chronicle of Monemvasia.