William IV, Prince of Orange
…of all the United Provinces of the Netherlands from 1747 until his death in 1751. William was born in Leeuwarden, Netherlands, the posthumous son of John William Friso, Prince of Orange, head of the Frisian branch of the House of Orange-Nassau, and of his wife Landgravine Marie Louise of Hesse-Kassel (or Hesse-Cassel). He was born six…