Col. Frederick Romilly was the youngest of the six sons of the juris consult, advocate, statesman and philanthropist Sir Samuel Romilly. His brothers were William (b. 1798), John (b. 1802, 1st Lord Romilly), Edward (b. 1804), Henry (b. 1805) and Charles (b. 1808). He had one sister, Sophie. On 28 November 1848 he married Lady Elizabeth Amelia Jane, the third daughter of Gilbert, 2nd Earl of Minto. Together they had three sons, Samuel Henry (b. 1849), Frederick William (b. 1854) and Hugh Hastings (b. 1856), and two daughters, Elizabeth Mary and Gertrude Emily.
Romilly was a Lieutenant-Colonel in the Scottish Fuselier Guards. He was M.P. for Canterbury from 1850 to 1852. He and his wife were among those invited to JW's famous Sunday breakfasts in the late 1870s (#05220).
Burke, Bernard, A Genealogical and Heraldic History of the Landed Gentry of Great Britain and Ireland, 2 vols, London, 8th ed., 1894; Burke, Bernard, A Genealogical and Heraldic History of the Peerage, Baronetage, the Privy Council, Knightage and Companionage, London, 71st ed., 1909; Who was Who: A Companion to Who's Who, London, 1920 et seq.