Johann von Geyso

Johann von Geyso
Johann von Geyso
Born	1593 Borken, Holy Roman Empire
Died	1661
Allegiance	Sweden Bohemian Estates Protestant Union  Denmark Landgraviate of Hesse-Kassel
Rank	General-Lieutenant
Battles/wars	Ingrian War Polish–Swedish War (1600–29) Thirty Years' War Battle of White Mountain Battle of Lutter Siege of Dorsten Battle of Nördlingen (1645) Battle of Wevelinghoven Hessian War

Johann von Geyso (1593 – 1661) was a German nobleman and General-Lieutenant, who fought during the course of the Thirty Years' War. After studying in a Dutch military academy, Geyso fought as a mercenary in the armies of Sweden, Bohemia, Denmark and the German Protestant Union. In 1628, having gained significant experience in warfare he returned to his native Hesse-Kassel which he served until the end of the Thirty Years' War, reaching the rank of commander in chief of the Langraviate's forces and becoming ennobled.