William V, a member of the House of Hesse, was Landgrave of Hesse-Kassel from 1627 to 1637. Having come to rule in unfavorable circumstances and in the midst of the Thirty Years' War, he continued to suffer losses of territory and wealth.

Maurice of Hesse-Kassel, also called Maurice the Learned or Moritz, was the Landgrave of Hesse-Kassel in the Holy Roman Empire from 1592 to 1627.