Weissenfels, city (1994 pop. 34,816), Saxony-Anhalt, E central Germany, on the Saale River. It is an industrial city and a rail junction. Manufactures include beer, shoes, paper, and metal products. Chartered in the 12th cent., Weissenfels passed to Prussia in 1815. The baroque palace (17th cent.) served as the residence of the dukes of Saxe-Weissenfels from 1680 to 1746.

Magdalena Sibylle of Saxe-Weissenfels (2 September 1648 – 7 January 1681) was a German noblewoman.

She was a daughter of August, duke of Saxe-Weissenfels, and his wife Anna Maria of Mecklenburg-Schwerin. Her paternal grandparents were John George I, Elector of Saxony and Magdalene Sibylle of Prussia.

On 14 November 1669, she married Duke Friedrich I of Saxe-Gotha-Altenburg. They had the following children:

1. Anna Sophie (22 December 1670 — 28 December 1728), married Ludwig Friedrich I, Duke of Schwarzburg-Rudolstadt. (Ancestor of Queen Victoria, Prince Albert, Carlota of Mexico and Leopold II of Belgium).
2. Dorothea Marie (22 January 1674 – 18 April 1713), married Ernst Ludwig I, Duke of Saxe-Meiningen (Ancestor of Prince Albert)
3. Friedrich II, Duke of Saxe-Gotha-Altenburg (28 July 1676 – 23 March 1732) (ancestor of Queen Victoria).
4. Johanna (1 October 1680 – 9 July 1704), married Adolf Friedrich II, Duke of Mecklenburg-Strelitz