Thessaly was an independent state in medieval Greece from 1267 or 1268 to 1394 CE, first as the Greek-ruled Thessaly and later as the Catalan and Latin-ruled Duchy of Neopatras. Under its sebastokrators, Thessaly was a thorn in the side of the Byzantine Empire and an ally of the Latin states in Greece and southern Italy. Following the death of the last Thessalian sebastokrator in 1318 CE, the Duchy of Neopatras was established by the Catalans and combined with the Duchy of Athens, with the two states mostly sharing the same rulers and fortunes until Thessaly was finally conquered by the Ottoman Turks in 1423 CE.
This is a companion discussion topic for the original definition at https://www.worldhistory.org/Thessaly_and_the_Duchy_of_Neopatras/.
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