Maj.-Gen. Edward James O'Brien, in 1836. After her death he married Maria Isabella, daughter of John Henry Smyth, of Heath Hall, in 1854. FitzRoy died at his house in Berkeley Square, London in 1829 and was buried at Wicken, Northamptonshire. Descendants Through his son Robert, he was a grandfather of five: Emily-Unah FitzRoy, Frances "Fanny" FitzRoy, Katherine FitzRoy, Robert O'Brien FitzRoy, and Laura Maria Elizabeth FitzRoy. References 1764 births 1829 deaths British Army generals Younger sons of dukes People educated at Harrow School Alumni of Trinity College, Cambridge Scots Guards officers British Army personnel of the French Revolutionary Wars People of the Irish Rebellion of 1798 Fitzroy, Charles C Members of the Parliament of the United Kingdom for English constituencies UK MPs 1802–1806 UK MPs 1806–1807 UK MPs 1807–1812 UK MPs 1812–1818 Members of the Parliament of Great Britain for English constituencies British MPs 1784–1790 British MPs 1790–1796 Royal American Regiment officers