Peat was born in
Hamsterley,
County Durham,
England, the son of John Peat (died 1805), a watchmaker and silversmith, and Anne Heron (died 1778), of the Herons of
Chipchase Castle. He was admitted to
Trinity College, Cambridge as a
ten-year man on 20 April 1790 and later received a
Doctor of Divinity degree from the
University of Glasgow in 1799. On 21 November 1790, Peat was appointed to the
Order of Saint Stanislaus by the
King of Poland. His obituary says that he was appointed for services rendered to that king by a relative of Peat and his entry in the
British Herald says that this was in connection to land willed to him by a John Vesey of
Warsaw. Peat's house was broken into on 25 October 1808 and papers relating to his Polish estates were reported stolen. In 1804, Peat was permitted by
King George III to accept and wear the order's insignias. Appearing in court in 1808 after being attacked outside of the
Drury Lane theatre, the defence objected to calling Peat "Sir" as he had not been appointed to any order of knighthood in the
United Kingdom. However, the
Lord Chief Justice, presiding, stated that knighthood was a "universal honour" and thus the appellation applied to him. On 8 August 1816 he was admitted as a joining member of The Sea Captain’s Lodge, which later became
Palatine Lodge No. 97, in Sunderland, having transferred from Felicity Lodge in London. On 14 November 1816 he was unanimously elected by the members to be the Worshipful Master of the Lodge but due to his absence was not installed as Worshipful Master. Peat had also been a
military chaplain in the
Peninsular War. He was appointed a steward of
Queen Charlotte's Lying-In Hospital in 1817, elected a fellow of the
Medico-Botanical Society of London in 1830 and had officiated at the marriage of the author
Lucy Clementina Davies to Francis Henry Davies at
St Marylebone Parish Church in 1823. ==Marriage and royal connections==