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 Trevethin and Oaksey
Baron Trevethin, of Blaengawney in the County of Monmouth, is a title in the Peerage of the United Kingdom. It was created in 1921 for the prominent judge Sir Alfred Lawrence, Lord Chief Justice of England from 1921 to 1922. The first baron's eldest son and heir, Hon. Clive Lawrence, predeceased him; he had been HM Procurator General and Treasury Solicitor from 1923 until his death in 1926. Hence, on the first baron's death, the title passed to his second son, Charles. His third son the Hon. Geoffrey Lawrence was also a noted jurist and served as the main British judge at the Nuremberg trials. In 1947 he was himself raised to the peerage as Baron Oaksey, of Oaksey in the County of Wilts. In 1959 he succeeded his elder brother Charles as third Baron Trevethin, although he continued to be known as Lord Oaksey. the titles are held by his grandson, the fifth Baron Trevethin and third Baron Oaksey, who succeeded in 2012. He is a QC who sits in the House of Lords as a Crossbench excepted hereditary peer following a by-election in 2015.