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The Duchy of Neopatras (Catalan: Ducat de Neopàtria; Sicilian: Ducatu di Neopatria; Greek: Δουκάτο Νέων Πατρών; Latin: Ducatus Neopatriae) was a principality in southern Thessaly, established in 1319. Officially part of the Kingdom of Sicily, itself part of the Crown of Aragon, the duchy was governed in conjunction with the neighbouring Duchy of Athens, it enjoyed a large degree of self-government. From the mid-14th century, the duchies entered a period of decline: most of the Thessalian possessions were lost to the Serbian Empire, internal dissensions arose, along with the menace of Turkish piracy in the Aegean and the onset of Ottoman expansion in the Balkans. Enfeebled, the Catalan possessions were taken over by the Florentine adventurer Nerio I Acciaioli in 1385–1390. The title of Duke of Neopatras was held by the heir of the King of Sicily.
When the Greek ruler of Thessaly, John II Doukas, died in 1318 without an heir, his domains fell into chaos. The Almogavars of the Catalan Company, who had recently conquered most of the Duchy of Athens to the south of Thessaly, took advantage of the situation to push north. Led by Alfonso Fadrique, the Catalans took Neopatras in 1319, and by 1325 had also conquered Zetounion, Loidoriki, Siderokastron and Vitrinitsa, as well as—apparently briefly—Domokos, Gardiki and Pharsalus. The central and northern part of Thessaly remained in Greek hands under a series of local magnates, some of whom recognized Byzantine suzerainty, like Stephen Gabrielopoulos of Trikala; others, however, like the Maliasenos family around Volos, turned to the Catalans for support.
The Greek rulers of Thessaly had long, but erroneously, been known as "Dukes of Neopatras" by Western European contemporaries from their capital, modern Ypati; this was a result of confusion from the family name of Doukas, which Western Europeans mistook as the title of "duke". As a result, the territory conquered by the Catalans in Thessaly was organized as the "Duchy of Neopatras" and was divided into five captaincies. The Catalans selected the infant Manfred, son of King Frederick III of Sicily, as their duke, but actual power was wielded by the Duke's local representative, the vicar-general, as well as by the marshal (mariscalus exercitus ducatuum) as the elected head of the Company members.
Most of the Duchy's possessions in Thessaly were lost when the region was conquered by Serbian Empire of Stefan Dušan in 1348, but Neopatras and the immediate region around it remained in Catalan hands. In 1377, the title of Duke of Athens and Neopatras was assumed by Peter IV of Aragon. It was preserved among the subsidiary titles of his successors, and was regularly included in the full title of the Spanish monarchs at least until the takeover of the Spanish crown by the House of Bourbon.
In 1378–79, the Aragonese lost most of their possessions in Boeotia to the Navarrese Company, while from the south the ambitious Florentine adventurer Nerio Acciaioli, lord of Corinth, took over Megara in 1374 and began applying pressure on Athens. By 1380, the Catalans were left only with the two capitals of Athens and Neopatras, as well as the County of Salona. Athens fell to Acciaioli in 1388, and in 1390 he captured Neopatras as well. Acciaioli could boast in the title "Lord of Corinth and of the Duchy of Athens and Neopatras", but his triumph was short-lived: in 1393/4 the Ottoman Turks conquered Neopatras and the entire Spercheios River valley.
Ecclesiastically, Neopatras largely corresponded to the Latin Archbishopric of Neopatras (L'Arquebisbat de la pàtria), which had one suffragan: Zetounion (Lamia). Among the Catalan archbishops was Ferrer d'Abella, who tried to have himself transferred to a west European see.
The vicars-general acted as local representatives of the dukes and were the governors of the twin duchy, originally for the Crown of Sicily, and after 1379 for the Crown of Aragon:
Text from the Wikipedia article “Duchy of Neopatras”, available under CC BY-SA 4.0.