William was born in Kassel as the son of Maurice, Landgrave of Hesse-Kassel, and of his wife Agnes of Solms-Laubach. Agnes died shortly after the birth of William and his father subsequently married Juliane of Nassau-Dillenburg. After losing much of the Hesse-Kassel territory to the Darmstadt line, and leaving the family in financial ruin, Maurice abdicated in favor of his son, William V.
William, having come to rule in unfavorable circumstances, and in the midst of the Thirty Years' War, continued to suffer losses of territory and wealth. William served as Landgrave for ten years; a tenure marked by defeats and losses.
In 1650, William's son, William VI, began his rule as Landgrave, and continued the Hesse-Kassel line, which almost perished under Maurice and William V.
External links
[1]Encyclopedia Britannica 1905 article - Hesse-Kassel