Stephen Gabrielopoulos

Stephen Gabrielopoulos (died 1332/1333) was a Byzantine magnate and semi-independent ruler in western Thessaly. After John II Doukas died without a male heir in 1318, Byzantine troops occupied northern Thessaly and the Catalans entered the south.

Amid the collapse of the principality he turned to Constantinople, acknowledging the emperor's suzerainty and receiving the title sebastokrator. As the emperor's governor he ruled a broad domain from Trikala to Kastoria. After his death his heirs quarrelled, drawing in Byzantine and Epirote armies. His lands soon passed under direct imperial rule.