William Louis, Prince of Anhalt-Harzgerode

William Louis of Anhalt-Harzgerode (Harzgerode, 18 August 1643 – Harzgerode, 14 October 1709), was a German prince of the House of Ascania and the last ruler of the principality of Anhalt-Harzgerode.

He was the eldest child and only son of Frederick, Prince of Anhalt-Harzgerode, by his first wife Johanna Elisabeth, daughter of John Louis, Prince of Nassau-Hadamar.

William Louis succeeded his father in Harzgerode when he died in 1670. From 1660 until 1668, he was the second in line to the principality of Anhalt-Bernburg, until the birth of the first son of his cousin, Prince Victor Amadeus.

In Laubach on 25 July 1671, William Louis married Elisabeth Albertine (b. Kassel, 6 March 1631 – d. Harzgerode, 2 January 1693), daughter of Albert Otto II, Count of Solms-Laubach. She was fourteen years his senior, and perhaps for this reason the union was childless.

In Frederiksborg near Copenhagen on 20 October 1695 William Louis married for a second time to Sophie Auguste (b. Dillenburg, 28 April 1666 - d. Usingen, 14 January 1733), daughter of Henry, Prince of Nassau-Dillenburg. This union was also childless, in spite the fact that Sophie Auguste was twenty-three years younger than William Louis.

Without any issue from his marriage, Anhalt-Harzgerode was merged back to the main line of Anhalt-Bernburg on his death, ruled at that time by his cousin Victor Amadeus.

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