determine the line of succession. Succession is by absolute primogeniture governed by the provisions of the Succession to the Crown Act 2013, as well as the Act of Settlement, 1701, and the Bill of Rights, 1689. This legislation limits the succession to the natural (i.e. non-adopted), legitimate descendants of Sophia, Electress of Hanover, and stipulates that the monarch cannot be a Roman Catholic, and must be in communion with the Church of England upon ascending the throne. Though these constitutional laws, as they apply to Solomon Islands, still lie within the control of the British Parliament, both the United Kingdom and Solomon Islands cannot change the rules of succession without the unanimous consent of the other realms, unless explicitly leaving the shared monarchy relationship; a situation that applies identically in all the other realms, and which has been likened to a treaty amongst these countries. Cultural role The King's Official Birthday is a public holiday in Solomon Islands where it is usually celebrated on the second Saturday of June every year. It is regarded as one of the most important events of the year in Solomon Islands. The day starts with the police marching band performing in the capital city of Honiara. Rallies are held all over the islands, which is followed by sporting events and custom dancing, and the celebrations and parties go long into the night. The Governor-General of Solomon Islands delivers a speech on the King's Birthday, and honours and medals are given to those who have done valiant things and great service for Solomon Islands and its people. Title The Royal Style and Titles Act 2013 of the National Parliament of Solomon Islands granted the monarch a separate title in his role as King of Solomon Islands. The new style was already in non-statutory use since 1988, when it was included in the Ministry of Foreign Affairs and External Trade Manual. The current style of the monarch of Solomon Islands is: Charles the Third, by the Grace of God, King of Solomon Islands and His other Realms and Territories, Head of the Commonwealth. Oath of allegiance The oath of allegiance in Solomon Islands is: Royal visits Members of the royal family occasionally visit Solomon Islands. Elizabeth II visited twice: in February 1974 (before independence) and in October 1982 (after the 1982 Commonwealth Games). Prince Philip, Duke of Edinburgh, accompanied her on both occasions, and also visited