Who married Countess Henriette Charlotte of Nassau-Idstein?

Henriette Charlotte of Nassau-Idstein (9 November 1693 – 8 April 1734), was a German noblewoman member of the House of Nassau and by marriage Duchess of Saxe-Merseburg.

Born in Idstein Castle, Idstein, she was the fourth of twelve children born from the marriage of George August, Count and since 1688 Prince of Nassau-Saarbrücken-Idstein and Henriette Dorothea of Oettingen-Oettingen. From her eleven older and younger siblings, only four survived to adulthood: Christine Louise (by marriage Princess of East Frisia), Albertine Juliane (by marriage Hereditary Princess of Saxe-Eisenach), Auguste Fredericka (by marriage Princess of Nassau-Weilburg) and Johannette Wilhelmine (by marriage Countess of Lippe-Detmold).

Maurice Wilhelm, Duke of Saxe-Merseburg (5 February 1688 – 21 April 1731) was a duke of Saxe-Merseburg and member of the House of Wettin.

He was born in Merseburg, the fifth (but second surviving) son of Christian II, Duke of Saxe-Merseburg, and Erdmuthe Dorothea of Saxe-Zeitz.