Frederick William of Brandenburg

Elector Frederick William was born in Berlin to George William, Elector of Brandenburg, and Elisabeth Charlotte of the Palatinate. His inheritance consisted of the Margraviate of Brandenburg, the Duchy of Cleves, the County of Mark, and the Duchy of Prussia.

Owing to the disorder in Brandenburg during the Thirty Years' War, he spent part of his youth in the Netherlands, studying at Leiden University and learning something of war and statecraft under Frederick Henry, Prince of Orange. During his boyhood, a marriage had been suggested between him and Christina, heir to the throne of Sweden, but although the idea was revived during the peace negotiations between Sweden and Brandenburg, it came to nothing.

When his father died in 1640, the 20-year-old's reign as elector began.

Military career

Frederick William was a military commander of wide renown, and his standing army would later become the model for the Prussian Army. He is notable for his joint victory with Swedish forces at the Battle of Warsaw, which, according to Hajo Holborn, marked "the beginning of Prussian military history", but the Swedes turned on him at the behest of King Louis XIV and invaded Brandenburg. After marching 250 kilometres in 15 days back to Brandenburg, he caught the Swedes by surprise and managed to defeat them on the field at the Battle of Fehrbellin, destroying the myth of Swedish military invincibility. He later destroyed another Swedish army that invaded the Duchy of Prussia during the Great Sleigh Drive in 1678. In the previous year, he led a successful siege of Stettin against the Swedish garrison. He is noted for his use of broad directives and delegation of decision-making to his commanders, which would later become the basis for the German doctrine of Auftragstaktik, and for using rapid mobility to defeat his foes.

On 7 December 1646 in The Hague, Frederick William entered into a marriage, proposed by Blumenthal as a partial solution to the Jülich-Berg question, with Luise Henriette of Nassau (1627–1667), daughter of Frederick Henry of Orange-Nassau and Amalia of Solms-Braunfels and his 1st cousin once removed through William the Silent. Their children were as follows:

William Henry, Electoral Prince of Brandenburg (21 May 1648 – 24 October 1649) died young.

Charles, Electoral Prince of Brandenburg (1655–1674)

Frederick I of Prussia (1657–1713), his successor

Amalie (19 November 1664 – 1 February 1665) died in infancy.

Henry (19 November 1664 – 26 November 1664) died in infancy.

Louis (8 June 1666 – 7 April 1687), who married Ludwika Karolina Radziwiłł, no issue.

On 13 June 1668 in Gröningen, Frederick William married Sophie Dorothea of Holstein-Sonderburg-Glücksburg, daughter of Philip, Duke of Schleswig-Holstein-Sonderburg-Glücksburg and Sophie Hedwig of Saxe-Lauenburg, widow of Christian Louis, Duke of Brunswick-Lüneburg.

Their children were the following:

Philip William (1669–1711)

Marie Amelie (1670–1739)

Albert Frederick (1672–1731)

Charles Philip (1673–1695)

Elisabeth Sofie (1674–1748)

Dorothea (6 June 1675 – 11 September 1676) died young.

Christian Ludwig (1677–1734)

In both self-confident women he found political advisers who thought and acted pragmatically. Both accompanied him on his campaigns. Luise Henriette also distinguished herself through charity, Sophie Dorothea through extraordinary business acumen, which allowed her to increase both her own fortune (and thus the inheritance of her children) and to strengthen the state economy. Both also left behind impressive palace buildings that they had built on their fiefs from their own income.

The suspicion that Dorothea worked towards a division of Brandenburg-Prussia in order to secure an income for her sons is regarded as refuted by historical scholarship. This negative perception is based on the fact that some publicists do not base their critical judgments on Dorothea on the primary sources, but on the centuries-old legends that are mainly based on publications after her death, especially by Karl Ludwig von Pöllnitz. There is no question, however, that the Elector's eldest surviving son and successor harbored at least corresponding fears about his stepmother.