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.
Peter Eagles
On 28 January 2008, Eagles was promoted to Chaplain to the Forces 1st Class (equivalent in rank to colonel) and appointed an Assistant Chaplain General. On 28 July 2011, he was collated and licensed as the Archdeacon for the Army, the most senior Anglican chaplain in the British Army, during a service at Lambeth Palace Chapel; as such he is a member of the General Synod of the Church of England. From 2013 to 2014, he attended the Royal College of Defence Studies to prepare for further promotion. On 14 July 2014, he was appointed the Deputy Chaplain General (equivalent in rank to brigadier), thereby becoming the second most senior chaplain in the British Army.