Original sentence: A member of the Palaiologos dynasty, he ruled the Byzantine Empire from 1449 to his death.Constantine XI Palaiologos or Palaeologus (Greek: Κωνσταντίνος ΙΑ' Δραγάσης Παλαιολόγος, Kōnstantinos XI Dragasēs Palaiologos, February 8, 1405 – May 29, 1453) was the last reigning Byzantine Emperor
Edited sentence: A member of the Palaiologos dynasty, he ruled the Eastern Roman Empire from 1449 to his death.Constantine XI Palaiologos or Palaeologus (Greek: Κωνσταντίνος ΙΑ' Δραγάσης Παλαιολόγος, Kōnstantinos XI Dragasēs Palaiologos, February 8, 1405 – May 29, 1453) was the last reigning  Roman Emperor