He quickly occupied Control the western Balkan lands from Belgrade to Larissa but in the next year he was betrayed by his cousin Alusian , who blinded him with a knife after he got drunk during a feast .

Alusian , who initially sought to lead the army against the Byzantines , secretly negotiated Communication a deal Arranging with Emperor Michael IV at Mosynopolis and was rewarded Rewards_and_punishments with a title of `` magistros '' .