Welbore Ellis, 1st Baron Mendip, PC, FRS was a British politician who sat in the House of Commons for 53 years from 1741 to 1794 when he was raised to the peerage as Baron Mendip. He held a number of political offices, including briefly serving as Secretary for the Colonies in 1782 during the American War of Independence.

Viscount Clifden, of Gowran in the County of Kilkenny, Ireland, was a title in the Peerage of Ireland. It was created on 12 January 1781 for James Agar, 1st Baron Clifden. He had already been created Baron Clifden, of Gowran in the County of Kilkenny, in 1776, also in the Peerage of Ireland. The Viscounts also held the titles of Baron Mendip in the Peerage of Great Britain from 1802 to 1974 and Baron Dover from 1836 to 1899, when this title became extinct, and Baron Robartes from 1899 to 1974, when this title became extinct, the two latter titles which were in the Peerage of the United Kingdom. The interrelated histories of the peerages follow below.