<Tr> <Th> Heir apparent </Th> <Td> Charles, Prince of Wales </Td> </Tr> <Tr> <Th> Remainder to </Th> <Td> the duke's heirs male of the body lawfully begotten </Td> </Tr> <P> Duke of Edinburgh, named after the city of Edinburgh, Scotland, is a substantive title that has been created four times for members of the British royal family since 1726 . The current holder is the Prince Philip, consort to Queen Elizabeth II . </P> <P> The title was first created in the Peerage of Great Britain on 26 July 1726 by George I, who bestowed it on his grandson Prince Frederick, who also became Prince of Wales the following year . The subsidiary titles of the dukedom were Baron of Snowdon, in the County of Caernarvon, Viscount of Launceston, in the County of Cornwall, Earl of Eltham, in the County of Kent, and Marquess of the Isle of Ely . These titles were also in the Peerage of Great Britain . The marquessate was apparently erroneously gazetted as Marquess of the Isle of Wight although Marquess of the Isle of Ely was the intended title . In later editions of the London Gazette the Duke is referred to as the Marquess of the Isle of Ely . Upon Frederick's death, the titles were inherited by his son Prince George . When Prince George became King George III in 1760, the titles "merged into the Crown", and ceased to exist . </P>

How many dukes of edinburgh have there been