His Majesty King Charles III succeeded to the throne on 8 September 2022, immediately on the death of Queen Elizabeth II, Britain's longest serving monarch. For most of us, this historic change of reign was the first in living history. But what really happens when one monarch succeeds another? This official publication charts an extraordinary period of transition: from the proclamations across the United Kingdom, The King's first address to the nation and Their Majesties' early engagements during a period of national mourning, to the Vigil of the Princes and the State Funeral of Queen Elizabeth II. Explore how the new reign was marked with changes to coins, banknotes, cyphers and stamps, the first State Visits at home and abroad, as well as the continuation of long-held fixtures in the royal calendar, including the much-loved Christmas broadcast. Discover unique insights into the behind-the-scenes preparations for the Coronation and spectacular photography from the day itself, as well as the stories and symbolism behind the regalia used during the ceremony. As the monarchy embarks on a new era, learn more about the new King and Queen, their individual areas of interest as sovereign and consort and their shared passion for sustainability, inclusivity and public service.