Alexander of Trebizond Co-emperor of Trebizond (1406–1459) Parents Theodora Kantakouzene Alexios IV of Trebizond Children Alexios V Megas Komnenos Siblings Despina Khatun Maria of Trebizond Eudokia Komnene, Princess of Trebizond John IV of Trebizond David II of Trebizond unknown daughter Comnene Partners Maria Gattilusio