John Egerton was the son of Henry Egerton, Bishop of Hereford, by Lady Elizabeth Ariana Bentinck, daughter of the Earl of Portland. After education at Eton College and at Oriel College, Oxford, he followed his father into the church and was ordained priest on 22 December 1745, and on the 23rd of the same month was collated by his father to the rectory of Ross-on-Wye. The rectory at Ross was a favorite residence of his for much of his life, to which he often invited friends and family members. Having had a boat specially made, he began taking his visitors on trips down the River Wye and such was their popularity that they became a regular feature. In consequence Egerton was later credited as "the father of the voyage down the Wye". Egerton was later made Bishop of Bangor 1756–68, during which time he caused controversy by appointing Thomas Bowles, a priest who spoke no Welsh, to a parish where almost no one spoke English. The case did not come to court until after Egerton had become Bishop of Lichfield. Afterwards, having previously declined the primacy of Ireland, he shortly succeeded as Bishop of Durham and held that office until his death in 1787. At Durham he displayed a talent for conciliation in promoting peace and prosperity in the county, which had been divided by elections, and in the city, which had been torn by disputes. He was also a benefactor to the county by encouraging public works: He promoted the enclosure of Walling Fen; assisted materially in rebuilding a bridge over the Tyne between Newcastle and Gateshead; and in 1780 granted a new charter to the city of Durham. In addition, he made extensive improvements at the episcopal palaces and was a liberal supporter of many religious and educational institutions.
Family
Egerton was the eldest son of Henry Egerton, himself a younger son of the 3rd Earl of Bridgewater. On 21 November 1748, he married his cousin, Lady Anne Grey, a daughter and coheiress of the 1st Duke of Kent. They had four children, one of whom died in infancy; the three others were:
Lady Anne died in 1780, and on 31 March 1782, Egerton married Mary Boughton, a sister of Sir Edward Boughton. Egerton died in 1787 and the title Earl of Bridgewater later passed to his eldest son in 1803.
