He was the younger son of Thomas Hickman-Windsor, 1st Earl of Plymouth, and notably represented Droitwich, Bramber and Monmouthshire in the House of Commons.
In 1712, he was created Baron Mountjoy in the Peerage of Great Britain, giving him a seat in the House of Lords at Westminster, one of Harley's Dozen.
His daughter and heiress, the Honourable Charlotte Jane Windsor, married John Stuart, 4th Earl of Bute.
In 1796, he was created Viscount Mountjoy, Earl of Windsor and Marquess of Bute.
[1] The second creation came in the Peerage of the United Kingdom in 1905 when Robert Windsor-Clive, 14th Baron Windsor, was made Viscount Windsor, of St Fagans in the County of Glamorgan.