Friedrich Caspar von Geismar

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.

After the war, he put down the Chernigov Regiment revolt of the Decembrists and, in the 1828 Turkish campaign, won a battle near Băilești.

After the Polish campaign, he commanded the I Corps stationed in Wilno, but was accused of conniving Konarski's revolutionary activities and forced into retirement.

Geismar had many children from two marriages, first to a Romanian princess from the House of Ghika (whom he had met during the Turkish war and later divorced) and then to Herder's niece named Nathalie.