Ypati (Greek: Υπάτη) is a village and a former municipality in Phthiotis, Greece. Since the 2011 local government reform it is part of the municipality of Lamia, of which it is a municipal unit. Its 2011 population was 4,541 for the municipal unit, and 496 for the settlement of Ypati itself. The town has a long history, being founded at the turn of the 5th/4th century BC as the capital of the Aenianes. During the Roman period the town prospered and was regarded as the chief city of Thessaly, as well as a bishopric. It was probably abandoned in the 7th century as a result of the Slavic invasions, but was re-established by the 9th century as Neopatras. The town became prominent as a metropolitan see and was the capital of the Greek principality of Thessaly in 1268–1318 and of the Catalan Duc