Duchy of Neopatras

Coat of Arms of the Duchy of Neopatras

The Duchy of Neopatria or Neopatras was one of the Crusader States set up in Greece after the conquest of the Byzantine Empire during the Fourth Crusade. It was situated in Central Greece, centered around the city of Neai Patrai (modern Ypati) in the Spercheios valley, west of Lamia.

In 1318-1319 the Almogavares of the Catalan Company, after having conquered most of the Duchy of Athens, expanded into the territories of the Despotate of Epirus in southern Thessaly, under Alfonso Frederick, the infante of the Kingdom of Sicily. The new territories were created a duchy and united with the Duchy of Athens. The Duchy was divided into the captaincies of Siderocastron, Neopatria, and Salona (modern Amfissa).

Part of the Duchy's possessions in Thessaly was conquered by the Serbs of Stefan Dusan in 1337. In 1377, the title of Duke of Neopatria was assumed by Peter IV of Aragon. It was preserved among the subsidiary titles of his successors, and is still included in the full title of the Spanish monarchs.

The attacks of the Byzantine Empire progressively diminished the territory of the duchy until what was left of it fell completely into the hands of the Republic of Florence in 1390.