Byzantine defectors

despot of Epirus

privateer (0900-1000)

Byzantine admiral

Neboulos () was a South Slavic military commander in the service of the Byzantine Emperor Justinian II (r. 685–695 and 705–711). Around 690, Neboulos was appointed commander a special military corps of about 30,000 men established by the Emperor. In 692/3, he and his corps joined in a major Byzantine campaign against the Umayyad Caliphate. However, in the Battle of Sebastopolis, Neboulos and about 20,000 of his men defected to the Arabs, allegedly bribed by the Arab commander Muhammad ibn Marwan. In retaliation, Justinian II disbanded the corps, executed or enslaved the remaining soldiers and

Byzantine leader

Byzantine governor of Chirmenkia and battle companion of Osman Ghazi

Byzantine general and politician

Byzantine general and governor

Muslim admiral

Byzantine defector

Tatzates or Tatzatios (, from Tačat) was a prominent Byzantine general of Armenian descent, who in 782 defected to the Abbasids and was appointed governor of Arminiya.

Chrysocheir (), also known as Chrysocheres, Chrysocheris, or Chrysocheiros (Χρυσόχερης/Χρυσόχερις/Χρυσόχειρος), all meaning "goldhand", was the second and last leader of the Paulician principality of Tephrike from 863 to his death in either 872 or 878.

governor of Thessalonica

Karbeas (), also Karbaias (), 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.

9th-century Byzantine general

Byzantine prince and military governor

Seljuk Vizier

Byzantine renegade and admiral of the Emirate of Crete

Byzantine general and exarch of Africa

Gothic leader