Fabian Gottlieb Fürst von der Osten-Sacken (Russian: Фабиа́н Вильге́льмович О́стен-Са́кен, romanized: Fabian Vilgelmovich Osten-Saken; 20 October [O.S. 9 October] 1752 – 7 April [O.S. 26 March] 1837) was a field marshal in the Imperial Russian Army of Baltic German descent who led the army against the Duchy of Warsaw. He later governed Paris during the city's brief occupation by the anti-French coalition.
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Early life
Osten-Sacken was born in Reval in the Russian Empire (present-day Estonia) into a noble family of Baltic German descent. He was the son of Baron Wilhelm Ferdinand von der Osten-Sacken (1700–1754) and his wife, Hedwig Eleonore von Udam (1712–1778). Prior to his death in 1754, his father was a captain-adjutant of Count Burkhard Christoph von Münnich.
Early career
Osten-Sacken was only two when his father died and spent his childhood in near-poverty. He entered the Koporye Musketry regiment as a sub-ensign on 18 October 1766.
In 1769, during the Russo-Turkish War, 1768–1774, he participated in the blockade of Khotin and in other engagements. For his military valour he was promoted in September of the same year to ensign and in 1770 to second-Lieutenant. From 1770 to 1773 he served in the Nasheburgsky Musketry regiment under command of Alexander Suvorov and fought against the Bar Confederation.