He was born the only son, and had two sisters Lady Mary Windsor, who married the Marquess of Downshire and Lady Harriet Windsor, who married the Hon. Robert Clive, a son of the Earl of Powis and grandson of Clive of India. Styled Lord Windsor from birth, he inherited his titles from his father on 12 June 1799 at the age of ten, along with his father's land at Tardebigge, the country seat Hewell Grange, and land in Shropshire and Glamorgan. A year later, his mother married Lord Amherst as his first wife, and bore him two sons. It is not clear if young Plymouth grew up with his stepfather ; if so, he was exposed to the influences of Amherst's wide-ranging Court and political connections, culminating in his failed embassy to China. Plymouth was educated at Harrow. He married Lady Mary Sackville, elder daughter of John Sackville, 3rd Duke of Dorset, on 5 August 1811. There was no issue of the marriage, and Lady Plymouth later married his stepfather Lord Amherst. Since Plymouth was richer than his brother-in-law De La Warr, his mother-in-law Arabella, Duchess of Dorset and Countess Whitworth, left Knole in 1825 to her elder daughter Mary, on the grounds that her husband could better afford the annual upkeep of the house. By 1829–30, the Countesses of Plymouth and De La Warr had between them.
Career
Lord Plymouth was admitted to the House of Lords probably at the usual age of 21, although he was not active in politics. He voted against the first Reform Bill on 8 October 1831 along with the majority of the House of Lords. He was involved in the creation of the Worcester Yeomanry Division which fought in Spain. At his death, he was Colonel of the Worcestershire Yeomanry Cavalry. Also during his tenure, the Worcester and Birmingham Canal was built through Tardebigge and good taxes were collected from the nailmakers of Redditch. The canal passes very close to Hewell Grange and was finished ten years after Windsor inherited his father's title. The canal was finished in 1799; however the reservoirs were built twenty years later, and finished in 1836. Windsor bought Barnt Green House from the tenant Yates family who had resided there for some years. According to his obituary, Lord Plymouth was fond of hunting and kept a large stud at Hewell Grange Worcestershire and at Melton. In October 1832, he entertained the Duchess of Kent and her young daughter Victoria at Hewell Grange
Death
Plymouth died on board his yacht, aged 44, at Deptford. During the night, he suffered an attack of apoplexy, and despite medical aid, died in the afternoon. He was buried in the family vault at St Bartholomew's Church in Tardebigge, Worcestershire. He is commemorated by an obelisk bearing his name, situated in the Lickey Hills Country Park and visible from Bromsgrove. His unusual forename 'Other' is traditional in the family and derives from a legendary Viking ancestor 'Otho' or 'Othere'.
Succession
At his death, Plymouth was succeeded in the earldom by his bachelor uncle the Hon. & Rev. Andrew Windsor who died unmarried in 1837. The earldom passed to the 7th Earl's youngest brother after which the earldom became extinct in 1843. The 6th Earl's death without issue meant that the Windsor barony fell into abeyance between his two sisters, until it was called out of abeyance in 1855 in favour of the younger sister Lady Harriet Clive, who became Harriet Windsor-Clive and whose sons Robert and George also took the name Windsor-Clive. Harriet's grandson Robert Windsor-Clive, 14th Baron Windsor was created Earl of Plymouth in 1905, and is the grandfather of the present Earl. Since the present Earl is the owner of the estates held by the 6th Earl, those might have descended by the 6th Earl's will to his younger sister Harriet and her heirs male.