The Most Distinguished Order of Saint Michael and Saint George is an order of chivalry . It was started on 28 April 1818 by George , Prince Regent , who became King George IV of the United Kingdom . The Most Distinguished Order of Saint Michael and Saint George is an order of chivalry founded on 28 April 1818 by George , Prince Regent , later George IV of the United Kingdom , while he was acting as Prince Regent for his father , George III .