William Louis, Count of Nassau-Dillenburg
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William Louis, Count of Nassau-Dillenburg (Dutch: Willem Lodewijk; West Frisian: Willem Loadewyk) (born March 13, 1560, Dillenburg, Hesse; died July 13, 1620, Leeuwarden, Netherlands) was Count of Nassau-Dillenburg from 1606-1620, and stadtholder of Friesland, Groningen, and Drenthe. He was the eldest son of John VI, Count of Nassau-Dillenburg.
William Louis served as a cavalry officer under William the Silent. Together with his cousin Maurice of Nassau, Prince of Orange, he helped plan the military strategy of The Netherlands against Spain from 1588-1609.
On November 25, 1587, he married his cousin, Anna of Nassau, daughter of William the Silent and Anna of Saxony, and older sister of Maurice of Nassau. Anna died less than six months later on June 13, 1588, and William Louis never remarried.
He was nicknamed "Us Heit" (West Frisian for "our father").