Dukes in the United Kingdom
Duke, in the United Kingdom, is the highest-ranking hereditary title in all four peerages of the British Isles. A duke thus outranks all other holders of titles of nobility (marquess, earl, viscount and baron).
Baron Margadale
Baron Margadale, of Islay in the County of Argyll, is a title in the Peerage of the United Kingdom. It was created on 1 January 1965 for the Conservative politician John Morrison. the title is held by his grandson, the third baron, who succeeded his father in 2003. The barony of Margadale is the most recent hereditary barony granted to an individual outside the royal family, and so Lord Margadale is the most junior of Britain's hereditary peers. The barony is named after the area of Margadale, in Islay.