Prince Frederick William III of Hesse (1854–1888); never married; died at sea on a voyage from Batavia to Singapore. Princess Elisabeth Alexandra Charlotte of Hesse (1861–1955); married Leopold, Hereditary Prince of Anhalt in June 1884 and had issue.
Frederick William (German: Friedrich Wilhelm; 16 February 1620 – 29 April 1688) was Elector of Brandenburg and Duke of Prussia, thus ruler of Brandenburg-Prussia, from 1640 until his death in 1688. A member of the House of Hohenzollern , he is popularly known as " the Great Elector "  ( der Große Kurfürst ) because of his military and political achievements.
22/11/2018 · Adolphus married his second cousin Augusta, the daughter of Prince Frederick of Hesse in June 1818 and had three children. Princess Mary born 25 April 1776 – died 30 April 1857. Mary married her cousin Prince William Frederick, Duke of Gloucester and Edinburgh in 1816 and had no children. Princess Sophia born 3 November 1777 – died 27 May 1848.