Monarchies similar to or like Monarchy of the United Kingdom

Sovereign country in north-western Europe, off the north-western coast of the European mainland. The United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland, and many smaller islands within the British Isles. Wikipedia

The British people, or Britons, are the citizens of the United Kingdom of Great Britain and Northern Ireland, the British Overseas Territories, and the Crown dependencies. British nationality law governs modern British citizenship and nationality, which can be acquired, for instance, by descent from British nationals. Wikipedia

Constitutional system of government in which a hereditary monarch is the sovereign and head of state of New Zealand. The current monarch, Queen Elizabeth II, ascended the throne on the death of her father, King George VI, on 6 February 1952. Wikipedia

Considered to have begun with the foundation of the English colonial empire in the late 16th century. Since then, many territories around the world have been under the control of the United Kingdom or its predecessor states. Wikipedia

Ireland–United Kingdom relations, also referred to as Irish–British relations, or Anglo-Irish relations, are the relations between the states of Ireland and the United Kingdom. The three devolved administrations of the United Kingdom, in Scotland, Wales and Northern Ireland, and the three dependencies of the British Crown, the Isle of Man, Jersey and Guernsey, also participate in multilateral bodies created between the two states. Wikipedia

National flag of the United Kingdom. Known as the Royal Union Flag. Wikipedia