Constantine Paulovitch, Grand-duke of Russia, son of Paul I.; distinguished himself at Austerlitz; was commander-in-chief in Poland, where he ruled as despot; waived his right to the throne in favour of his brother Nicholas (1779‒1831).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Constantine Nicolaievitch * Constantine XIII.