William married on 18 July 1871 in
Wassenaar,
Princess Marie of the Netherlands, member of the
House of Orange-Nassau, younger daughter of
Prince Frederick of the Netherlands, second son of
William I of the Netherlands, and
Princess Louise of Prussia, the youngest daughter of
Frederick William III of Prussia. They had six children: •
Friedrich, Prince of Wied (27 June 1872 – 18 June 1945) married
Princess Pauline of Württemberg (1877–1965), had issue. • Prince Alexander of Wied (28 May 1874 – 15 January 1877) •
Wilhelm, Prince of Albania (26 March 1876 – 18 April 1945) married
Princess Sophie of Schönburg-Waldenburg (1885–1936), had issue. • Prince Victor of Wied (7 December 1877 – 1 March 1946) married Countess Gisela of
Solms-Wildenfels (30 December 1891,
Wildenfels,
Germany – 20 August 1976,
Oberammergau,
Germany) on 6 June 1912, had issue: • Marie Elisabeth of Wied (14 March 1913 - 30 March 1985,
Augsburg,
Germany) • Benigna Viktoria of Wied (23 July 1918 - 1972). Married Ernst Hartmann, Baron of
Schlotheim (27 December 1914,
Wiesbaden,
Germany - 31 October 1952,
Wiesbaden,
Germany) on 19 December 1939. They had two daughters: • Viktoria Elisabeth, Baroness of Schlotheim (b. 11 April 1948,
Wiesbaden,
Germany) • Christine, Baroness of Schlotheim (b. 22 July 1950,
Wiesbaden,
Germany) • Princess Louise of Wied (24 October 1880 – 29 August 1965) • Princess Elisabeth of Wied (28 January 1883 – 14 November 1938) ==Honours==