In 1761 Lord Kildare was created Earl of Offaly and Marquess of Kildare in the Peerage of Ireland and in 1766 he was further honoured when he was made Duke of Leinster, becoming by this time the Premier Duke, Marquess and Earl in the Peerage of Ireland.
In 1761 Lord Kildare was created Marquess of Kildare and Earl of Offaly in the Peerage of Ireland, Webb, Alfred. M.H. Gill & Son (1878) and in 1766 he was created Duke of Leinster, becoming by this time the Premier Duke, Marquess and Earl in the Peerage of Ireland.