Background
He was the older and only surviving son of Peregrine Osborne, 3rd Duke of Leeds and his first wife Elizabeth, youngest daughter of Robert Harley, 1st Earl of Oxford and Earl Mortimer.
He was the older and only surviving son of Peregrine Osborne, 3rd Duke of Leeds and his first wife Elizabeth, youngest daughter of Robert Harley, 1st Earl of Oxford and Earl Mortimer.
Osborne was educated at Westminster School and then Christ Church, Oxford, where he matriculated in 1731.
In the same year, he succeeded his father as duke. Osborne received a Doctorate of Civil Law in 1738 and became a Fellow of the Royal Society a year later. Osborne became a Lord of the Bedchamber in 1748 and was appointed Justice in Eyre south of Trent in November of the same year.
He was sworn of the Privy Council of Great Britain a year later and became Justice in Eyre north of Trent in 1761, an office he held until 1774.
Osborne was a Deputy Lieutenant of the West Riding of the County of Yorkshire. In 1766 he inherited the office of Governor of Scilly and the lease of these islands from his father-in-law.
Osborne died, aged 73 at Street James"s Square and was buried in the Osborne family chapel at All Hallows Church, Harthill, South Yorkshire. He was succeeded in his titles by his third and only surviving son Francis.
Royal Society.