Her only daughter Frederica had contracted in 1748 an unhappy marriage with Charles Eugene, duke of Wurttemberg.
On the 31st of October 1797 Gustavus married Frederica Dorothea, daughter of Charles Frederick, grand-duke of Baden, a marriage which might have led to a war with Russia but for the fanatical hatred of the French republic shared by the emperor Paul and Gustavus IV., which served as a bond of union between them.
Man, without energy or resolution, and he allowed W himself to be entirely led by his old guardian the duke of Brunswick, and by his wife Frederica Wilhelmina of Prussia, a woman of marked ability, to whom he entirely deferred.
On the 21st of August 1745, by the command of his aunt, he married the princess Sophia Augusta Frederica of AnhaltZerbst, who exchanged her name for that of Catherine Aleksyeevna.
(1786-1848), king of Denmark and Norway, the eldest son of the crown prince Frederick and Sophia Frederica of Mecklenburg-Schwerin, was born on the 18th of September 1786 at Christiansborg castle.