paragraph_text: Helena Kantakouzene (Ελένη Καντακουζηνή) (1333. – 10. prosinca 1396.) bila je bizantska carica.<ref>Frances Kianka, "The Letters of Demetrios Kydones to Empress Helena Kantakouzene Palaiologina", Dumbarton Oaks Papers: Homo Byzantinus: Papers in Honor of Alexander Kazhdan, 46 (1992), str. 155-164