The Fall of Constantinople in 1453 and the subsequent fall of the successor states of the Eastern Roman Empire marked the end of Byzantine sovereignty. Since then, the Ottoman Empire ruled the Balkans and Anatolia, although there were some exceptions: the Ionian Islands were under Venetian rule, and Ottoman authority was challenged in mountainous areas, such as Agrafa, Sfakia, Souli, Himara and the Mani Peninsula. Orthodox Christians were granted some political rights under Ottoman rule, but they were considered inferior subjects. The majority of Greeks were called rayas by the Turks, a name that referred to the large mass of subjects in the Ottoman ruling class. Meanwhile, Greek intellectuals and humanists who had migrated west before or during the Ottoman invasions began to compose orati