Benjamin Sullivan, (1720-1767), O’Sullivan Mór, Clerk of the Crown for Co. Cork and Waterford Kinsman to Laurence Sullivan, Chairman East India Company.  Barry Crosbie’s book 212 Cambridge press says they wee brothers adn sons o Philip O’Sullivan and Miss Irwin a trading family with Roscommon and Cork connections.  He suggests Benjamin became a Judge in Calcutta which seems unlikely.

https://books.google.ie/books?id=DpvRF0W5KIMC&pg=PA45&lpg=PA45&dq=clerk+of+the+crown+for+cork+1750&source=bl&ots=US9h-C-l5P&sig=BNrHrORmT-zggnlr20xZ3uVq9eg&hl=ga&sa=X&ved=0ahUKEwiymt717p3LAhVDnw4KHbbMB_kQ6AEIHzAB#v=onepage&q=clerk%20of%20the%20crown%20for%20cork%201750&f=false

https://durrushistory.wordpress.com/2013/12/17/laurence-sulivan-1713-1786-cork-born-chairman-of-the-east-india-company-and-m-p/

According to Denny Lane, Cork Antiquarian Benjamin Sullivan styled himself the head of the O’Sullivan Mór, sept.

https://durrushistory.wordpress.com/wp-admin/post.php?post=7557&action=edit&message=6&postpost=v2

1720-1767 Benjamin Sullivan Attorney, Barrister, 1752 Clerk of the Crown for Counties Cork and Waterford. Thomas Harrison writing clerk to him 1742, Married Bridget Limerick daughter of Dr. Limerick, Rector Kilmoe (Ballydehob), 1742 Father Phipil mother Elizabeth Irwin a Presbeterian, Parish of St Paul. Benjamin Sullivan Senior Esq., eminent Atttorney died London 1767, May have been Recorder of Cork 1765. Son Sir Benjamin Sullivan, Kt, Judge Supreme Court Madras, the Right…