His father was the brother of Charles Jenkinson, 1st Earl of Liverpool, a colonel in the army, joint secretary for Ireland and gentleman-usher to Queen Charlotte; he died on 1 May 1805.
[2] On 23 July 1825, Jenkinson was elected Bishop of St David's, and on 4 August 1825 was appointed canon of Durham Cathedral.
On 13 June 1827 he became Dean of Durham, and held the deanery, then worth £9,000 a year, with his bishopric for the remainder of his life.
The eldest son, George Samuel Jenkinson, succeeded his uncle, Sir Charles, as eleventh baronet in 1855.
[1] A granddaughter was Viscountess Maidstone who funded much of the early twentieth century restoration and whose tomb lies in the Cathedral.