Fredericka of Saxe-Gotha-Altenburg (17 July 1715 – 2 May 1775), was a German princess, a member of the House of Wettin and by marriage Duchess of Saxe-Weissenfels.

The union produced five children, all of them died in infancy:[2] After her husband's death in 1746 at the age of 31, Fredericka retired to Dryburg Castle in Langensalza, the usual Wittum of the Dowager Duchesses of the Weissenfels branch.

Shortly after, she acquired a bourgeois garden and more lands in the east of the old town, in front of the city walls.

Between 1749-1751 was built under her orders a Rococo style palace called the Fredericka's Castle (German: Friederikenschlösschen).

[citation needed] After Fredericka's death her former personal physician, Christian Friedrich Stöller, acquired the property.