Frederick married Lady Egidia Montgomerie on 4 Jul 1861 in Westminster, London, England. Egidia (daughter of 13th Earl of Eglinton Archibald William Montgomerie and Theresa Newcomen) was born about 1843 in Kilwinning, Ayrshire, Scotland; died on 13 Jan 1880 in Suffolk, England. [Group Sheet] [Family Chart]