Many of this ruler's policies, especially with regard to agriculture, were strongly influenced by the time he spent at the court of Frederick Henry of Orange, whose daughter Louise Henriette he married.
This ruler had to surrender most of the territory he won during one war by the terms of the Treaty of Oliva, and after reconquering it, he would later lose that same territory again at the Treaty of Saint-Germaine-en-Laye. Many of this ruler's policies, especially with regard to agriculture, were strongly influenced by the time he spent at the court of Frederick Henry of Orange, whose daughter Louise Henriette he married. This ruler attempted to maintain neutrality during the First Northern War between Sweden and Poland, but after his territories were occupied by Swedish armies under Charles X Gustav, (*) he was forced to lead his army at the Battle of Warsaw, where his performance earned him territorial concessions to remain a Swedish ally. This ruler remained allied to Louis XIV until it became clear that Louis would not help him win Pomerania, at which point this man joined the Grand Alliance. It was with a victory over the Swedes in 1675 that this ruler gained his famous sobriquet. For 10 points, identify this father of Frederick I who consolidated the Prussian state during his rule from 1640 to 1688.
This ruler had to surrender most of the territory he won during one war by the terms of the Treaty of Oliva, and after reconquering it, he would later lose that same territory again at the Treaty of Saint-Germaine-en-Laye.
Frederick William, the Great Elector [accept Frederick William, Elector of Brandenburg or Der Grosse Kurfurst; prompt on "Frederick William" but do not accept or prompt on "Frederick William" followed by any number]