
Captain John Luttrell-Olmius, 3rd Earl of Carhampton, a Royal Navy officer and politician who sits in the House of Commons of Great Britain between 1774 and 1785, is born on December 11, 1739. He is styled The Honourable John Luttrell between 1768 and 1787 and as The Honourable John Luttrell-Olmius between 1787 and 1829.
Born John Luttrell, he is the second son of Simon Luttrell, 1st Earl of Carhampton by Judith Maria Lawes, daughter of Sir Nicholas Lawes, Governor of Jamaica. He is the grandson of Colonel Henry Luttrell and the brother of Henry Luttrell, 2nd Earl of Carhampton, James Luttrell, and Lady Anne Luttrell, Duchess of Cumberland and Strathearn. He is a member of the Irish branch of the ancient family of Luttrell and a descendant of Sir Geoffrey de Luterel, who establishes Luttrellstown Castle, County Dublin, in the early 13th century.
Luttrell was a captain in the Royal Navy but retires in 1789. He is returned to Parliament for Stockbridge in 1774, a seat he holds until 1775, and again between 1780 and 1785. Between 1785 and 1826 he is a commissioner of HM Customs and Excise. He succeeds his elder brother to the earldom in 1821. This is an Irish peerage and does not entitle him to an automatic seat in the House of Lords.
In 1766, Lord Carhampton marries the Honorable Elizabeth Olmius (1742-97), daughter of John Olmius, 1st Baron Waltham. In 1787, out of respect after the death of his father-in-law, he assumes by Royal Licence the additional surname of “Olmius.” In 1798, he sells the Olmius family seat of Newhall to the founding nuns of New Hall School. There are three children from his first marriage (however only his daughter survives to adulthood):
- Lady Frances Maria Luttrell (b. 1768), married Sir Simeon Stuart, 4th Baronet
- James Luttrell (d. 1772)
- John Luttrell (d. 1769)
Lord Carhampton marries secondly Maria Morgan, daughter of John Morgan, in 1798. They have one child:
- Lady Maria Anne Luttrell (1799–1857), married Lieutenant-Colonel Hardress Robert Saunderson
Lord Carhampton dies in Greater London, England, on March 19, 1829, aged 89, at which time the Earldom becomes extinct. He is buried at St. Pancras, Soper Lane graveyard, London.




