The Despotate of Epirus was one of the successor states of the Byzantine Empire when it disintegrated following the Fourth Crusade's capture of Constantinople in 1204 CE. It was originally the most successful of those successor states, coming close to recapturing Constantinople, but after 1230 CE, it was geographically limited to Epirus itself and occasionally the neighboring territories of Thessaly and the Ionian islands. For the next two centuries, Epirus mostly maintained its independence, although it had to navigate being at the end of the Byzantine and Italian spheres of influence. Finally, in 1479 CE, the last territories of the Despotate of Epirus were conquered by the Ottoman Empire.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Despotate_of_Epirus/.