William, Duke of Jülich-Cleves-Berg

William of Jülich-Cleves-Berge (William I of Cleves, William V of Jülich-Berg) (German: Wilhelm der Reiche; 28 July 1516 – 5 January 1592) was a Duke of Jülich-Cleves-Berg (1539–1592). William was born in and died in Düsseldorf. He was the only son of John III, Duke of Jülich-Cleves-Berg, and Maria, Duchess of Jülich-Berg.[1] William took over rule of his father's estates (the Duchy of Cleves and the County of Mark) upon his death in 1539. Despite his mother having lived until 1543, William also became the Duke of Berg and Jülich and the Count of Ravensberg.

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William the Rich
Portrait c. 1554
Duke of Jülich-Cleves-Berg
Reign	6 February 1539 – 5 January 1592
Predecessor	John III
Successor	Johann Wilhelm
Born	28 July 1516 Düsseldorf, Duchy of Berg
Died	5 January 1592(1592-01-05) (aged 75) Düsseldorf, Duchy of Berg
Burial	Collegiate Church of St. Lambertus, Düsseldorf
Spouses	Joan III of Navarre ​ ​ (m. 1541; ann. 1545)​ Archduchess Maria of Austria ​ ​ (m. 1546; died 1581)​
Issue	Marie Eleonore, Duchess of Prussia Anna, Countess Palatine of Neuburg Magdalene, Countess Palatine of Zweibrücken Karl Friedrich of Jülich-Cleves-Berg Sibylle, Margravine of Burgau Johann Wilhelm, Duke of Jülich-Cleves-Berg
House	La Marck
Father	John III, Duke of Cleves
Mother	Maria, Duchess of Jülich-Berg