Royal dukedoms in the United Kingdom
In the British peerage, a royal duke is a member of the British royal family, entitled to the titular dignity of prince and the style of "His Royal Highness" who holds a dukedom. Dukedoms are the highest titles in the British roll of peerage and the holders of these particular dukedoms are Princes of the Blood Royal. The holders of the dukedoms are royal not the titles themselves. They are titles created and bestowed on legitimate sons and male-line grandsons of the British monarch, usually upon reaching their majority or marriage. The titles can be inherited but cease to be called "royal" once they pass beyond the grandsons of a monarch. As with any peerage, once the title becomes extinct, it may subsequently be recreated by the reigning monarch at any time.
Baron Rodney
Baron Rodney, of Rodney Stoke in the County of Somerset, is a title in the Peerage of Great Britain. It was created in 1782 for the naval commander Sir George Brydges Rodney, 1st Baronet. He had previously been created a Baronet, of Alresford in the County of Southampton, in the Baronetage of Great Britain on 22 January 1764. His son, the second Baron, represented Northampton in Parliament. He was succeeded by his eldest son, the third Baron. He served as Lord Lieutenant of Radnorshire. His younger brother, the fourth Baron, assumed by Royal licence the additional surname of Harley in 1804. On his death the titles passed to his younger brother, the fifth Baron. He was Rector of Elmley in Kent. He was succeeded by his nephew, the sixth Baron. He was the son of Captain the Hon. Robert Rodney, fourth son of the second Baron. The sixth Baron's great-grandson, the ninth Baron, was an active member of the House of Lords and served as a Delegate to the Council of Europe and the Western European Union. the titles are held by the latter's grandson, the eleventh Baron, who succeeded in 2011.The present heir presumptive to the barony is Nicholas Simon Harley Rodney (b. 1947), a great-great-grandson of the 6th Baron
The heir presumptive's heir is his brother Christopher Lossie Charles Rodney (b. 1957)
The next in line is the heir presumptive's first cousin David James Rodney (b. 1965). His heir is his elder son Harry John Melville Rodney (b. 1992)