Sir John Cust, 3rd Baronet Cust

Rt. Hon. Sir John Cust, 3rd Bt. was born on 29 August 1718.2 He was the son of Sir Richard Cust, 2nd Bt. and Anne Brownlow.2 He was baptised on 25 September 1718 at St. Martin-in-the-Fields Church, Covent Garden, London, England.3 He married Etheldred Payne, daughter of Thomas Payne and Elizabeth Folkes, on 8 December 1743.2 He died on 24 January 1770 at age 51.1 He was buried on 8 February 1770 at Belton, Lincolnshire, England.3 He died intestate and his estate was administered on 26 April 1770.3

Rt. Hon. Sir John Cust, 3rd Bt. was educated at Eton College, Eton, Berkshire, England.3 He succeeded to the title of 3rd Baronet Cust, of Stamford, co. Lincoln [E., 1677] on 25 July 1734.2 He graduated from Corpus Christi College, Cambridge University, Cambridge, Cambridgeshire, England, in 1739 with a Master of Arts (M.A.).3 He was admitted to Middle Temple on 26 November 1742 entitled to practice as a Barrister.3 He held the office of Member of Parliament (M.P.) for Grantham between 1743 and 1770.3 He held the office of Clerk of the Household between 1747 and 1751, to Frederick, Prince of Wales.3 He held the office of Steward of the Household in 1751, to the Dowager Princess of Wales.3 He held the office of Clerk of the Household between 1751 and 1760, to George, Prince of Wales.3 He gained the rank of Colonel in 1759 in the service of the South Battalion, Lincolnshire Militia.3 He held the office of Speaker of the House of Commons between 3 November 1761 and 19 January 1770.1 He was invested as a Privy Counsellor (P.C.) on 24 January 1762.3 He has an extensive biographical entry in the Dictionary of National Biography.4

Sir John Cust, 3rd Baronet PC (29 August 1718 – 24 January 1770) was a British politician. He served as Speaker of the House of Commons from 1761 to 1770.

Cust was the son of Sir Richard Cust, 2nd Baronet, and Anne Brownlow, daughter of Sir William Brownlow, 4th Baronet. He was educated at Eton and Corpus Christi College, Cambridge. Cust was elected to the House of Commons for Grantham in 1743, seat he would continue to represent until his death 27 years later. In 1761 he was appointed Speaker of the House of Commons, which he remained until shortly before his death in 1770. He was admitted to the Privy Council in 1762.

Cust married Etheldred Payne, daughter of Thomas Payne, in 1743. He died in January 1770, aged 51, and was succeeded in his title by his son Brownlow Cust, who in 1776 was raised to the peerage as Baron Brownlow in recognition of his father's services.