Constantine XI Palaiologos
Andreas Palaiologos, a nephew of the last Byzantine Emperor Constantine XI Palaiologos and the head of what remained of the Palaiologos family, started calling himself Emperor of Constantinople in 1483 and, possibly childless, sold what he viewed as his imperial title to Charles VIII of France in 1494. The following Kings of France kept the claim until Charles IX in 1566, when it went into disuse. Charles IX wrote that the imperial Byzantine title "is not more eminent than that of king, which sounds better and sweeter."