"William IV (Willem Karel Hendrik Friso; 1 September 1711 – 22 October 1751) was Prince of Orange from birth and the first hereditary Stadtholder of all ...
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the United Provinces of the Netherlands from 1747 till his death in 1751. During his whole life he was furthermore ruler of the Principality of Orange-Nassau within the Holy Roman Empire." - (en.wikipedia.org 31.01.2020)
