He was the son of Admiral of the Fleet John Halliday (who in 1821 assumed by Royal license the surname and arms of Tollemache in lieu of Halliday), eldest son of Lady Jane Halliday, youngest daughter and co-heir of Lionel Tollemache, 4th Earl of Dysart.
Many properties in the local area and Grantham are owned by Buckminster Estates, who are linked with the Tollemache family who live in Buckminster Park: the former home of the Earl of Dysart.
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The Dysart Mausoleum which stands near the church was built around 1800 by the trustees of the estate of Lionel Tollemache, 8th Earl of Dysart, who died in 1798.
After the Rebellion, he bought an estate in County Wicklow, and in 1802, married, at Dublin, Alicia Weldon, who is variously described as being the daughter of Lady Weldon, and a niece of the Earl of Dysart, though which ones are meant is not specified.
John Grant, 13th Earl of Dysart (born 22 October 1946), later her successor as Earl of Dysart and owner of the Rothiemurchus estate, married Philippa Chance on 8 May 1971 and has issue
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On her mother's death Lady Katherine's elder sister, Lady Rosamund Agnes (1914–2003) became the 11th Countess of Dysart, but never married or had issue, on her death in December 2003 Lady Katherine succeeded to the titles of Countess of Dysart and Lady Huntingtower.
Part of the former abbey precinct was donated to Leicester Town Council (the predecessor of the modern City Council) by the 8th Earl of Dysart.
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Prior to the 9th Earl of Dysart's donation of the abbey precinct, another attempt was undertaken, but again, no trace of the abbey was found.
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Lionel Tollemache, 8th Earl of Dysart, sold the land east of the River Soar (known as Abbey Meadows) in 1876; this was to allow Leicester Town Council to undertake flood prevention work.
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At one time this organization enjoyed the patronage of members of the British establishment including HRH Princess Alice of Athlone, the Duke of Buccleuch, the Earl of Dysart, Lord Gisborough, and William Massey, the Prime Minister of New Zealand.
William John Manners Tollemache, 9th Earl of Dysart DL (3 March 1859 – 22 November 1935) in the Peerage of Scotland, was also a Baronet (cr.1793) in the Baronetage of Great Britain, Lord Lieutenant of Rutland (1881–1906), and Justice of the Peace for Leicestershire and Lincolnshire.