Signature of Constantine XI Palaiologos as Emperor of the Romans
Constantine XI Palaiologos
Nicol, Donald M. (1992). The Immortal Emperor: The Life and Legend of Constantine Palaiologos, Last Emperor of the Romans. Cambridge: Cambridge University Press. <a href="//commons.wikimedia.org/wiki/Special:BookSources/978-0511583698" title="Special:BookSources/978-0511583698">ISBN 978-0511583698</a>, plate 10