William married Karoline Wilhelmina Denmark and Norway in 1763. Karoline (daughter of King of Denmark and Norway Frederick, V and Queen of Denmark Louisa Hanover) was born on 10 Jul 1747 in Castle Christiansborg, Copenhagen, Copenhagen, Denmark; was christened on 10 Jul 1747 in Christiansborg Slot, K2benhavn, K2benhavn, Denmark; died on 14 Jan 1820 in Kassel, Hessen-Nassau, Prussia; was buried on 19 Jan 1820 in Kassel, Hessen-Nassau, Prussia. [Group Sheet] [Family Chart]