Countess Louise Henriette of Nassau

Louise Henriëtte had to abandon her love for Henri Charles de La Trémoille, Prince of Talmant, son of Henry de La Trémoille, as her mother had royal ambitions for her. However, attempts to conclude an engagement with King Charles II of England came to nothing. Finally she was forced to marry Frederick William, Elector of Brandenburg (1620-1688), "the Great Elector," at The Hague on 7 December 1646, her nineteenth birthday, on the proposal of the Brandenburg diplomat Joachim Friedrich von Blumenthal.

The Electorate of Brandenburg regarded this marriage as beneficial by reason of the connections with the Orange family it created in the hope of obtaining assistance for Brandenburg's struggle for influence in Pomerania.

The couple lived in Cleves for the first years of their marriage, but they moved to Brandenburg, Frederick William's seat, in 1648. During her marriage, Louise Henriëtte followed her spouse and traveled between The Hague, Königsberg, Berlin and Cleves on campaigns, inspections, war and battle fields in Poland and Denmark. She acted as her husband's political adviser and was described as a pragmatist. She managed, through correspondence with the Queen of Poland, Marie Louise Gonzaga, to make an alliance with Poland in exchange for the Polish recognition of Prussia as a province of Brandenburg. It was said of her : "Few Electresses had been allowed so much influence".

In 1650 her husband gave her the Amt Bötzow, an electoral domain with large estates and numerous places and farmers that were subject to taxes. Louise Henriëtte had a new castle in Dutch style built in Bötzow in 1650-52 and called it Oranienburg Palace, after her family, the House of Orange-Nassau. It became the name for the entire town in 1653. She was also involved in the design and development of the Lustgarten in Berlin. In 1663, she installed the first porcelain cabinet in Europe. In 1665, she founded an orphanage with places for 24 children.

She was described as truly kind and gentle with a sharp intellect: her advice was vital for her spouse, and their marriage was considered a role model. During time of war, she made great efforts to soften the damages upon society.

A Protestant religious community known as the Luise-Henrietten-Stift in nearby Lehnin Abbey was named after her.

With Frederick William, Elector of Brandenburg, she had six children, only three of whom lived to adulthood:

• William Henry (1648-1649), died in infancy
• Charles (1655-1674)
• Frederick (1657-1713), the first King in Prussia
• Amalie (1664-1665), died in infancy
• Henry (1664-1664), died in infancy
• Louis (1666-1687), married Ludwika Karolina Radziwiłł

Luise Henriette also suffered many miscarriages:

• A miscarried daughter (1649)
• A miscarried daughter (1650)
• A miscarried son (1651)
• A miscarried son (1652)
• A miscarried daughter (1653)
• A miscarried son (1654)
• A miscarried daughter (1656)
• A miscarried daughter (1659)
• A miscarried son (1660)
• A miscarried daughter (1661)
• A miscarried daughter (1663)
• A miscarried son (1665)

Luise Henriette died in Berlin and was buried in the Berliner Dom.