Helena Palaiologina (daughter of Demetrios)

Helena Palaiologina (Greek: Ἑλένη Παλαιολογίνα; 23 April 1442 – c.  1469), known also as Helena Hatun, was the daughter and only child of Demetrios Palaiologos, Despot of Morea, a brother of the final Byzantine emperor Constantine XI Palaiologos. Her mother was Theodora Asanina of the Asen family, a family which had once ruled Bulgaria. Famous for her beauty, Sultan Mehmed II, who had conquered Constantinople in 1453, took her into his harem after his conquest of the Morea in 1460, but soon decided to leave her in province, possibly due to fear of being poisoned by her.

Instead of remaining in the sultan's harem, Helena received a pension and large estate at Adrianople, where she lived until her death of unknown causes around 1469, only about 27 years old.