Britain's Monarchy Britain is a constitutional monarchy.That means the Monarch is the head of state,but his or her power is limited by constitutional rules. But...Who is this Monarch? Queen Elizabeth Il Date of birth: 21 April 1926 Family: Prince Philip and four children and six grandchildren Coronation: 2 June 1953 in Westminster Abbey Hobbies: Horses and dogs fppt.comBritain‘s Monarchy Britain is a constitutional monarchy. That means the Monarch is the head of state, but his or her power is limited by constitutional rules. But... Who is this Monarch? Queen Elizabeth II Date of birth: 21 April 1926 Family: Prince Philip and four children and six grandchildren Coronation: 2 June 1953 in Westminster Abbey Hobbies: Horses and dogs