The third Baronet served as Master-General of the Ordnance for Ireland and was created Baron Stewart of Ramelton and Viscount Mountjoy in the Peerage of Ireland in 1683. The second Viscount was also Master-General of the Ordnance for Ireland. The third Viscount was created Earl of Blessington in the Peerage of Ireland in 1745. The peerages became extinct on his death in 1769.
^ abBurke, Sir Bernard; Burke, Ashworth Peter (1910). A Genealogical and Heraldic History of the Peerage and Baronetage, the Privy Council, Knightage and Companionage. Harrison. p. 1707.