[1] He was born in Mansfield, Nottinghamshire, one of the four sons of Samuel Jebb, a prosperous brewer, and Elizabeth Gilliver.
Through their maternal ancestors, the Gillivers, the Jebb family would later claim descent from the Dutch statesman Johan de Witt.
[3] He was Treasurer of Christ Church Cathedral, Dublin from 1740[4] and Dean of Cashel[5] from 1769,[6] holding both posts until his death in 1787.
[7] He married Anne Gansel, daughter of David (or Daniel) Gansel of Donnyland House, Colchester, and had two sons: John Jebb, a political and social reformer and a clergyman noted for his Socinian views, and David.
[8] His grandnephew, grandson of his brother Richard,[9] also called John Jebb was Bishop of Limerick, Ardfert and Aghadoe from 1823 until 1833.