ヘッセン＝カッセル方伯領
The Landgraviate of Hesse-Kassel was founded by William IV the Wise, the eldest son of Philip I. On his father's death in 1567, the Landgraviate of Hesse was divided into four parts. William IV received about half of the territory, with Kassel as his capital. Hesse-Kassel expanded in 1604 when Maurice, Landgrave of Hesse-Kassel inherited the Landgraviate of Hesse-Marburg from his childless uncle, Louis IV, Landgrave of Hesse-Marburg (1537–1604).