 Michael himself did not long outlive these successes: in late 1214 or in 1215, he was assassinated in his sleep at Velegrada by a servant called Rhomaios. According to the historian John V. A Fine, "whether he was hired to do the act, and, if so, by whom is unknown". As his only surviving son was illegitimate and underage, Michael was succeeded by his half-brother Theodore. Theodore had been in the service of Nicaea, and Michael had requested Laskaris to send him to Epirus because his own son's position was weak. In the event, Theodore not only sidelined the young Michael II, but according to the hagiography of St. Theodora of Arta, sent him and his mother to exile in the Peloponnese for the duration of his reign. Theodore proved a powerful and warlike ruler, greatly expanding the Epirote state and capturing Thessalonica in 1224, where he was crowned emperor. The rise of Theodore's Empire of Thessalonica ended abruptly with his defeat and capture by the Bulgarians at the Battle of Klokotnitsa in 1230, that allowed the exiled Michael II to return to Epirus and recover his father's domain.
