The sixth of May 2023 marked the first Coronation in the United Kingdom after seventy years since Queen Elizabeth was coronated on 2 June 1953. King Charles III took oath for service and perfect justice. During his crowning ceremony, the Coronation Oath Act of 1688 required the King to declare that he would maintain the established Anglican Protestant Church, rule according to laws agreed upon in Parliament, and case law, with justice and mercy to be executed in his judgment. However, for the first time, a preface was added to the coronation oath in which the Archbishop said the Church of England “will seek to foster an environment where people of all faiths and beliefs may live freely”. King Charles III has enormous responsibilities as Head of State for the United Kingdom of 19 countries and the Commonwealth of Nations. What does his legacy mean for the diversity of people of the UK and the Commonwealth? What can the National Health Service expect from his legacy and vision?