Thomas was the son of caesar Gregorios Preljub (Greek: Grēgorios Prealimpos), the Serbian governor of Thessaly, who died in late 1355 or early 1356.
Tomé era o fillo do César Gregorio Preljub (en grego: Γρηγόριου Πρελούμπου), o gobernador serbio de Tesalia, que faleceu a finais de 1355 ou comezos de 1356.