 In in Offenbach am Main on 11 September 1832, Frederick Augustus married Princess Marie Luise Charlotte of Hesse-Kassel (b. Copenhagen, 9 May 1814 - d. Schloss Hohenburg, 28 July 1895).She was a daughter of Prince William of Hesse-Kassel by his wife Princess Louise Charlotte of Denmark, a sister of King Christian VIII of Denmark.Marie was an older sister of the later Queen Louise, wife of King Christian IX of Denmark.