Wikipedia:
Emmanuel de Saint-Priest
Guillaume Emmanuel Guignard, vicomte de Saint-Priest (1776-1814) was a French émigré general who fought in the Russian army during the French Revolutionary Wars and the Napoleonic Wars.
He was the eldest son of prominent émigré diplomat François-Emmanuel Guignard, comte de Saint-Priest (1735-1821), one of King Louis XVI of France's last ministers.
Guillaume Emmanuel became a major-general in the Russian army under Czar Alexander I of Russia, and fought against the forces of Napoleon. He died during the Allied invasion of France in 1814 at Laon.
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