The Prime Minister of Thailand is the Head of Government of the Kingdom of Thailand. The Prime Minister is also the chairman of the Cabinet of Thailand and represents the government at home and the country abroad. The post of Prime Minister has existed since 1932, after a bloodless revolution, forced the absolutist King Prajadhipok to grant for the people of Siam their first constitution. Under the newly established constitutional monarchy, the first Prime Minister of Siam was Phraya Manopakorn Nititada.