His paternal grandmother Helena was a Perceval, and the granddaughter of the Earl of Egmont.
Avon Castle became the seat of the Earl of Egmont from 1912 to 1938, although after 1932 the family saw little use for their private halt as the 11th Earl preferred to spend his time in Canada.
In 1761, the English named the island Egmont Key for the Earl of Egmont.
This spree culminated notably in the robbery of around 13 guineas and a pistol from Lord Percival, the son of the Earl of Egmont who was travelling to Bath; the attack took place on 22 June 1760 near Devizes.
His titles he inherited from his father, John Perceval, 2nd Earl of Egmont upon his death in 1770: He succeeded to the title of 2nd Baron Lovel and Holland, Baron Lovel and Holland of Enmore, co.
He became proprietor in 1860 of the substantial Egmont Hotel in Kanturk through renting it from the estate of the Earl of Egmont.
Port Egmont was the first British settlement in the Falkland Islands, on Saunders Island and is named after the Earl of Egmont.
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It was during this time that Johnston began to draw pastels, in the process depicting a number of powerful people to whom she was related by marriage; among these were John Percival, later to become Earl of Egmont, and one of the Earls of Barrymore.
In late 1811 Mitford received an offer of a position in the civil service from Lady Bridget Perceval, who was daughter-in-law of the Earl of Egmont, and a family connection of Mitford’s relative and patron Lord Redesdale.