What is "karbeas"

Karbeas , also Karbaias (Καρβαίας), was a Paulician leader, who, following the anti-Paulician pogroms in 843, abandoned his service in the Byzantine army and went over to the Arabs. With the aid of the emir of Melitene, Umar al-Aqta, he founded the Paulician principality of Tephrike, which he ruled until his death in 863. During this period he participated alongside Umar in several raids against the Byzantine Empire.