Johannes Dukas
Johannes Dukas (Greek Ἰωάννης Δούκας ) is the name of the following people:
- Johannes Dukas (Kaisar) († 1088), Byzantine aristocrat, brother of Emperor Constantine X.
- Johannes Dukas (Megas Dux) († before 1137), Byzantine governor of Dyrrhachion and admiral, brother-in-law of Emperor Alexios I.
- Johannes Dukas Komnenos (1128–1176), Byzantine military commander and governor of Cyprus
- Johannes Dukas (Sebastokrator) (around 1126–1200), Byzantine Sebastokrator, uncle of the Emperors Isaac II and Alexios III.
- Johannes Angelos Dukas (around 1152 – after 1222), Byzantine aristocrat, brother of the emperors Isaac II and Alexios III.
- Johannes Komnenos Dukas († 1244), ruler of Thessaloniki and Thessaly
- John III Dukas Batatzes (1193–1254), Byzantine emperor, see John III. (Byzantium)
- Johannes Dukas Batatzes (nephew of Johannes III) (around 1215–1240), Byzantine Sebastocrator
- Johannes Dukas Palaiologos († 1274/1275), Byzantine general, brother of Emperor Michael VIII.
- John I Dukas Komnenos († 1289), ruler of Thessaly
- John II Dukas († 1318), ruler of Thessaly
- John II. Komnenos Dukas († 1335), ruler of Epirus, see Giovanni II. Orsini
