Constantine XIII., Palæologus, the last of the Greek emperors; had to defend Constantinople against a besieging force of 300,000 under Mahomet II., and though he defended it bravely, the city was taken by storm, and the Eastern empire ended in 1543.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Constantine Paulovitch * Constantinople