| 释义 |
John Doukas, Latinized as Ducas ({{lang-el|{{lang|grc|Ἰωάννης Δούκας}}}}, Iōannēs Doúkas) is the name of several Byzantine aristocrats and their descendants. It may refer to any of the following: - John Doukas (Caesar) ({{floruit|1074|1088|lk=on}}), brother of Emperor Constantine X Doukas
- John Doukas (megas doux) ({{circa|1064|lk=on}} – before 1136), brother-in-law of Alexios I Komnenos
- John Doukas (sebastokrator) ({{circa|1126|1200}}), cousin of Emperors Isaac II Angelos and Alexios III Angelos
- John Doukas Komnenos (1128–1176)
- John Doukas Kamateros ({{floruit|1150|1189}}), senior Byzantine minister and military leader
- John III Doukas Vatatzes (1193–1254), Emperor of Nicaea 1222–54
- John Komnenos Doukas (died 1244), ruler of Thessalonica and Thessaly 1237–1244
- John Doukas (son of Michael II), son of Michael II of Epirus, hostage in Constantinople
- John I Doukas of Thessaly, ruler of Thessaly 1268–1289
- John II Doukas of Thessaly, ruler of Thessaly 1303–1318
- John II Orsini (also called Doukas), ruler of Epirus 1323–1335
- John Uroš, ruler of Thessaly 1370–1373
- John Ducas (investor) (born 1998), young American entrepreneur
{{hndis|Doukas, John}} |