Oscar von Heidenstam

Oscar von Heidenstam was born on 12 December 1774 in Savonlinna, Southern Savonia, Finland to Karl von Heidenstam.
In 1790, he joined the Swedish Army as a Kornett. In 1792, he made Löjtnant. In 1795, he made Ryttmästare. In 1798, he made Major. In 1803, he made Överstelöjtnant. 
In 1803, he had a son: Adolf von Heidenstam. 
In 1808, he made Överste. In 1813, he made Generalmajor. 
He was killed in battle in Dessau-Roßlau, Saxony-Anhalt, Germany in 1813.