Charles III is head of state of 15 Commonwealth realms. Governors-general are appointed by the monarch in realms outside the United Kingdom to exercise many of his functions such as appointing prime ministers, dissolving Parliament, giving royal assent to legislation, and exercising other reserve powers.
Charles III has had 19 governors-general representing him during his reign and has appointed five new governors-general since his accession.
Within the United Kingdom, counsellors of state exercise some royal functions when the King is unavailable.