William IV, Landgrave of Hesse-Kassel
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. Wikipedia
Born: June 24, 1532, Kassel, Germany
Died: August 25, 1592 (age 60 years), Kassel, Germany
Parents: Philip I, Landgrave of Hesse and Christine of Saxony
Spouse: Duchess Sabine of Württemberg (m. 1566–1581)
Siblings: George I, Landgrave of Hesse-Darmstadt