John Doukas (Greek: Ἰωάννης Δούκας, Iōannēs Doúkas) was a son of the Despot of Epirus, Michael II Komnenos Doukas, and a general in Byzantine service.
[citation needed] John was the second-born son of the Despot of Epirus, Michael II Komnenos Doukas, and Theodora Petraliphaina.
[1][2] In 1261 his mother brought him as a hostage to the Byzantine court at Constantinople, where he married Tornikina Komnene (of unknown first name), the second-born daughter of the sebastokrator Constantine Tornikios.
[3][4] The couple had at least one daughter, Helena, but the marriage was unhappy, with John apparently despising his wife.
As a result, he was imprisoned and blinded in 1280, and committed suicide shortly after.