Cesar Bonnin was naturalised in England in 1710. His wife’s name is unknown. He had three sons: William (b1711), Richard (b1712 – probably died in infancy as there are no further records), Peter (b1714)

Cesar, William and Peter were all men of substance. It’s not clear what Cesar did, but William became a priest and Peter a lawyer. A search in the National Archives shows a good number of business transaction records involving one or both of them, sometimes with their father.

Rev. William Bonnin of Prittlewell (1711-1786)
Rev. William Bonnin seems to have held a number of livings. He was often referred to as William Bonnin of Prittlewell and sometimes as William Bonnin of Pimlico, or of Fulham, or of St George, Hanover Square. William married Mary Burbage at Whitehall Chapel in 1736. In 1735 he had agreed her marriage settlement, with her mother (Millicent Burbage, widow) and assigned her the proceeds of some annuities. At his death in 1786, he names a number of friends and servants in his will and makes some specific bequests, but there is no mention of a wife or of any children, nephews or nieces. He made a bequest to charity: the proceeds of some annuities (possibly the same ones that he settled on his wife some fifty years earlier, it’s hard to be sure) were assigned to the Corporation for the Sons of the Clergy. This was later described as “William Bonnin’s gift”, but there is no indication of how much it was worth. It appears that he left no issue.

Peter Bonnin of Lincolns Inn (1714-1759)
Like his brother, Peter Bonnin is referred to in more than one way: as Peter Bonnin of Lincolns Inn, of Staples Inn or of St Clement Danes. His will, made in 1759 during his last illness, seems to have caused great confusion. It contained nothing but the appointment of an executor – John Dighton. Peter’s signature wasn’t witnessed, so two friends of his had to swear a deposition that the handwriting was actually his, before the executor could get on with administering the estate. The will was proved the same year, but while the estate was being administered the executor died and in 1765 powers of administration had to be granted to his widow. In 1809, the estate still not having been settled, a further administrator was appointed, Mrs Dighton having also died. Rev. William Bonnin, clerk, brother of Peter, is the only family member mentioned in the legal papers.

Since neither of Cesar’s sons appear to have had any children, the Bonnin name then died out in this branch of the family.