William Earle Welby was born on 14 November 1768 at Denton in Lincolnshire. He was the eldest son of Sir William Earle Welby, 1st Baronet, of Denton and the only son by his first wife, Penelope Glynne, a daughter of Sir John Glynne, 6th Baronet, and his wife Honora Conway. The younger Welby was admitted at Emmanuel College, Cambridge, in 1786 and matriculated the following year, though he took no degree. He worked at the Newark banking firm of Welby & Co. until his father's death, and was a Lieutenant in the Ossington Volunteers from 1806.
Family
Welby married on 30 August 1792, Wilhelmina Spry, daughter and heir of William Spry, who was Governor of Barbados from 1767 to 1772, and his wife Katherine Cholmeley. She died on 4 February 1847. Together, they had seven daughters and three sons:
Elizabeth Welby. She married, on 17 February 1829, Thomas James Ireland of Ousden Hall, Suffolk, and had with him five children.
Arthur Earle Welby. Rector of Holy Trinity, Hulme, Manchester. He married, on 13 May 1843, Julia, daughter of Capt. George Macdonald of the 68th Regiment; she died on 18 October 1892. Together they had seven children.
Wilhelmina Welby. She married, on 17 May 1825, the Rev. Frederick Browning, Prebendary of Salisbury; he died on 3 December 1858.
Katherine Welby. She married, on 13 May 1822, the Rev. Thomas Welby Northmore, her first cousin and the son of Thomas Northmore of Cleve,, a writer, and Penelope Welby, a daughter of the first baronet; the Rev. Northmore died on 16 July 1829; he and his wife had two children.
In the late eighteenth and early nineteenth centuries, Sir William Manners, Bt., was attempting to take control of the borough of Grantham, which had previously been controlled by two land-owning aristocrats, the Duke of Rutland and Lord Brownlow; Manners's grandfather, Lord William Manners, had purchased the manor, his son accumulated much wealth, and Sir William purchased houses in Grantham and worked to be returned as a member of parliament for the Borough. Welby's father, who was Lord of the Manor of nearby Denton, stood to oppose Manners in 1802, being supported by Rutland and Brownlow, and was elected, serving until 1806. After he declined to stand again, a compromise was formed between Manners and the land-owners, but it did not last and, by the time the 1807 elections began, Manners was hoping to control the Borough's seats in Parliament. Welby stood to oppose Manners, as his father had done before him, and, like his father, was elected. As a Member, he was an infrequent voter and is not known to have made any speeches; he also applied for leaves of absence in 1808 and 1812. When he did vote, it was generally with the Government, voting, for instance, in 1810 on the side of the Government over an inquiry into the British Walcheren Campaign against the Dutch in 1809. In the borough, Welby remained opposed to the imposition of Manners and, shocked at Rutland's decision to sell him land in return for hunting rights, he barred Rutland from hunting on the Welby estates. At the 1812 election, Welby was able to gain the support of enough of the borough's freemen and land-owners in the corporation, and secured a compromise with Manners, allowing for him to be re-elected. Again, he voted infrequently, most notably with the Government against Catholic relief in 1813. In 1815, his father died and he inherited the Baronetcy and his estates, after which time he attended the House less regularly. He was re-elected in 1818, but declined to stand in 1820 and never returned to the House. In the years following, he remained somewhat active in local politics and became Sheriff of Lincolnshire for a year beginning in 1823.
Later life
After 1823, Welby left public office and returned to his estates. He died on 3 November 1852.