Friedrich Caspar von Geismar

Baron Friedrich Caspar von Geismar (; 1783–1848) was a German military officer who spent the best part of his career in the service of Imperial Russian Army. He eventually rose to the rank of Full General and became an adjutant to Nicholas I of Russia.

Biography He was born on 12 May 1783 on the Severinghausen estate near Ahlen into a noble family known since the 13th century. His father was a chamberlain at the court of the king of Prussia. He was an heir to the Dössel line of an old Austrian-German noble family of Geismar zu Riepen from the castle of Warburg. His parents were Baron Clemens August von Geismar, the commander of the Guard Regiment of the Kings of Prussia, and Bernadina de Berswardt.

On 2 August 1798, at the age of 15, he joined the Lower Austrian 4th Infantry Regiment "Hoch- und Deutschmeister". He served as an officer in the 1799 Battle of Novi and the 1800 Battle of Pozzolo and was nominated for membership of the Military Order of Maria Theresa for bravery, but this was rejected because of his age.