He was the son of Sir Robert Deane, 2nd Baronet of Muskerry and Springfield Castle, Company Limerick by his wife Anne Brettridge, one of the three daughters and co-heiresses of Captain Roger Brettridge (1630-1683) of Castles Brettridge, Cope and Magner, Company
He succeeded to the baronetcy in 1712. He served as High Sheriff of County Cork for 1714 and sat in the Irish House of Commons for Charleville from 1713 to 1715. Deane married Jane Sharpe, only daughter of Reverend William Sharpe.
On the latter"s death in 1751 the title devolved to the third son Robert.
He was again a Member of Parliament (Member of Parliament) for Cork County from 1728 until his death in 1747.
