Constantine XI Palaiologos
Helena Dragaš (, "Jelena Dragaš", , "Elenē Dragasē"; c. 1372 – 23 March 1450) was the empress consort of Byzantine emperor Manuel II Palaiologos and mother of the last two emperors, John VIII Palaiologos and Constantine XI Palaiologos. She served as regent after the death of her son John VIII in 1448 until 1449.