William IV, Prince of Orange (d. 1759)
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 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.