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Gustaf Horn was born at Örbyhus in Uppsala County, Sweden. He was the youngest son of Field Marshal Carl Horn and Agneta von Dellwig. He born while his father was imprisoned in Örbyhus Castle at Tierp. He was born into the Swedish noble family Horn af Kankas and was educated extensively in European universities. He studied military sciences under prince Maurice of Orange in the Netherlands. As colonel, Gustav Horn took part in siege of Riga in 1621 and was seriously wounded. He led troops which conquered Tartu in Livonian Estonia. With Count Jakob De la Gardie, he led defense of Livonia against Poland in late 1620s. At age 35, he was elevated to the rank of Field Marshal by King Gustav II Adolf.
Örbyhus in Uppsala County, Sweden