On 9th September 2015, Queen Elizabeth II became the longest-serving British monarch. One of the most enduring images of her coronation in 1953 is that of Her Majesty surrounded by her dukes. Their influence once extended beyond the merely ceremonial, they were a crucial part of the architecture that supported the monarchy. Only 24 noble dukes now remain and this documentary - with unique access to the dukes of Norfolk, Argyll, Montrose and Marlborough – explores both the fascinating history and function of their great dukedoms in modern day Britain.