Prince Christopher Henry von Lieven, Lord of Mesothen (Latvian: Kristofers Heinrihs fon Līvens; Russian: Христофор Андреевич Ливен; German: Christoph Heinrich von Liewen; Swedish: Christoffer Henrik von Liewen af Eksjö; French: Christophe de Lieven; born 6 May 1774 - died 10 January 1839) was a Livonian nobleman, Russian general, ambassador to London in 1812-1834, and educator of tsesarevich Alexander Nikolaievitch.
Christopher Lieven was born on May 6, 1774 (Old Style) into an old noble family of Lieven (Livonian-originated medieval Baltic German knights), as the third son of Baroness Charlotte von Gaugreben, afterwards 1st Princess Lieven (1743-1828) and Freiherr Otto Heinrich Andreas von Lieven af Eksjö (1726-1781) (source: Gustav Elgenstierna, Ättartavlor). Since his youth, his mother served as governess of the younger children of the then Grand Duke Paul Petrovich of Russia, Heir-Apparent to the throne of the then Empress Catherine II. As such, young baron Christopher's "foster-siblings" were a number of young grand dukes and grand duchesses, including his future liege lord the Emperor Nicholas I (1796-1855).