British royal family

Succession

Main articles: Succession to the British throne and Coronation of the British monarch

William, Prince of Wales, heir apparent to the British throne
The relationship between the Commonwealth realms is such that any change to the laws governing succession to the shared throne requires the unanimous consent of all the realms. Succession is governed by statutes such as the Bill of Rights 1689, the Act of Settlement 1701 and the Acts of Union 1707. The rules of succession may only be changed by an Act of Parliament; it is not possible for an individual to renounce his or her right of succession. The Act of Settlement restricts the succession to the legitimate Protestant descendants of Sophia of Hanover (1630–1714), a granddaughter of James I and VI.
Upon demise of the Crown (the death of a sovereign), their heir immediately and automatically succeeds (hence the phrase "The king is dead, long live the king!"), and the accession of the new sovereign is publicly proclaimed by an Accession Council that meets at St James's Palace. Upon their accession, a new sovereign is required by law to make and subscribe several oaths: the Accession Declaration as first required by the Bill of Rights, and an oath that they will "maintain and preserve" the Church of Scotland settlement as required by the Act of Union. The monarch is usually crowned in Westminster Abbey, normally by the Archbishop of Canterbury. A coronation is not necessary for a sovereign to reign; indeed, the ceremony usually takes place many months after accession to allow sufficient time for its preparation and for a period of mourning.
When an individual ascends the throne, it is expected they will reign until death. The only voluntary abdication, that of Edward VIII, had to be authorised by a special Act of Parliament, His Majesty's Declaration of Abdication Act 1936. The last monarch involuntarily removed from power was James VII and II, who fled into exile in 1688 during the Glorious Revolution.
After death of her majesty, late Queen Elizabeth II, her son, prince Charles III (Charles Philip Arthur George) became the king of the United Kingdom and the 14 other Commonwealth realms.