Henry Mainwaring in the King's cause in the English Civil War, was exiled to France, and died in poverty. He was buried at St. Giles' Church, Camberwell, London, on 15 May 1653. Mainwaring married a daughter of Sir Thomas Gardiner in 1630. She died in 1633. His brothers were Sir Arthur Mainwaring, Carver to Prince Henry, George Mainwaring, the defender of Tong Castle, and Sir Thomas Mainwaring, the Recorder of Reading. The Mainwaring family was old and distinguished, probably having arrived in England in the train of William the Conqueror (1066). Henry Mainwaring Sir Henry Mainwaring (1587–1653), was an English lawyer, soldier,
William Massey-Mainwaring who lent items from his collection to public galleries around the country. He was involved in Conservative politics and in 1892 put his name forward as a candidate for the Hackney Central constituency. Eventually he stood aside in favour of Sir Andrew Scoble. In 1895 he was elected as member of parliament for Finsbury Central, holding the seat until 1906. He died suddenly from influenza and diabetes at his London home in March 1907, aged 61. William Massey-Mainwaring The Honourable William Frederick Barton Massey-Mainwaring (28 May 1845 – 12 March 1907) was an Irish art collector and Conservative Party politician