Monarchy is the head of the country, Which ruled the country in the form of sovereignty. It can be seen that the monarchy played an important role since the past. such as in the Sukhothai Kingdom, Thailand has been government by the monarchy called paternalistic system. Later in the Ayutthaya Kingdom, There was a new changed the government system, but still government by monarchy. The government called the absolute monarchy and in the present, The government of Thailand is changed to democracy system, which the monarchy as head of state. It can be seen that the monarchy has very important in the government of Thailand.