Uzun Hassan
Haydar married Martha 'Alamshah Begom, Uzun Hassan's daughter, who gave birth to Ismail I, founder of the Safavid dynasty. Martha's mother Theodora—better known as Despina Khatun—was a Pontic Greek princess, the daughter of the Grand Komnenos John IV of Trebizond. She had been married to Uzun Hassan in exchange for protection of the Grand Komnenos from the Ottomans.