William IV, Landgrave of Hesse-Kassel (died 1573)

William IV, Landgrave of Hesse-Kassel

16th-century German landowner and astronomer

William IV of Hesse-Kassel, also called William the Wise, was the first Landgrave of the Landgraviate of Hesse-Kassel. He was the founder of the oldest line, which survives to this day.