It was established well before any documentation.
Yes, it has a constitution, that is why it a constitutional monarchy. But it is not one document but a collection. It is similar to Englands.
monarchy
a monarchy
A monarchy
English Bill of Rights
Presently England, part of the UK, is a constitutional monarchy ruled by an elected parliament.
The Federalists were against the Constitution. They wanted their government to be a monarchy -- more like Englands government.
Trick question: There was, and never has been, a 'monarchy' established in the US.
magna carta
England's Civil War (1642-1651) led to the conflict between Parliament and the monarchy, ultimately resulting in the execution of King Charles I in 1649. Following the war, the Commonwealth was established under Oliver Cromwell, but its authoritarian rule led to dissatisfaction. The Restoration of Charles II in 1660 saw the monarchy reestablished, but with Parliament gaining significant power, leading to the Glorious Revolution of 1688. This culminated in the Bill of Rights (1689), which limited the powers of the monarchy and laid the foundation for a constitutional monarchy in England.
The currant Monarch (the person who is to be or has been crowned king or queen) is the lead person, this is currently Queen Elizabeth II.
That would be the magna carta, the agreement between the people and monarchy. It was the result of King Johns tyranical riegn. It was signed by barons, bishops and abbots in power and was the first document imposed on the king by his subjects.