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.
Francis Egerton, 1st Earl of Ellesmere
In Peel's resignation honours (June 1846), Egerton was the only person raised to the peerage. He became Earl of Ellesmere and Baron Brackley (a revival of titles formerly held as subsidiary titles by the Earls of Bridgewater). The "Times" commented on Egerton's elevation: "The only other circumstance of a Ministerial 'going out' worth mention is the reported elevation of Lord Francis Egerton to the Upper House. His Lordship's position by birth and inheritance is so splendid, and so thoroughly sustained by his character and talents, that his accession to the Peerage seems little more than the correction of an accidental anomaly. He adds, at least, as much to the credit of the order as he can possibly receive in return."