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 Mainwaring caused some amusement when they appealed to Labour to withdraw their candidate to stop splitting the working-class vote. Mainwaring succeeded in increasing his majority to 8,433. In the new Parliament, Mainwaring won sixth place on the ballot to introduce a Private Member's Bill and chose to try to make employers liable for injuries to workmen caused by the negligence of fellow workmen. When debated, a Conservative MP moved to reject the Bill, and the Government declared their opposition; the Bill was defeated by 146 to 85. In the next session, Mainwaring won again, this time in first place; he introduced