Constitutional Monarchy first emerged in England. Initally the British monarchy was absolute, however, the nobility under King John felt that the king had abused his power, and had forced him to sign a document called the Magna Carta.

When did the constitutional monarchy start?

Constitutional Monarchy, A Tradition

In Britain, the Glorious Revolution of 1688 led to a constitutional monarchy restricted by laws such as the Bill of Rights 1689 and the Act of Settlement 1701, although limits on the power of the monarch ('A Limited Monarchy') are much older than that, as seen in our Magna Carta.

How did monarchy start?

The British monarchy traces its origins from the petty kingdoms of early medieval Scotland and Anglo-Saxon England, which consolidated into the kingdoms of England and Scotland by the 10th century. England was conquered by the Normans in 1066, after which Wales also gradually came under control of Anglo-Normans.