The Yang di-Pertuan Agong, also known as the Supreme Head of the Federation, the Paramount Ruler, or simply the Agong and also unofficially as the King of Malaysia, is the constitutional monarch and head of state of Malaysia. The office was established in 1957, when the Federation of Malaya gained independence from the United Kingdom. The Yang di-Pertuan Agong is elected by the Conference of Rulers, comprising the nine rulers of the Malay states, with the office de facto rotated between them, making Malaysia one of the world's few elective monarchies.

Constitutional monarchy, also known as limited monarchy, parliamentary monarchy or democratic monarchy, is a form of monarchy in which the monarch exercises their authority in accordance with a constitution and is not alone in making decisions. Constitutional monarchies differ from absolute monarchies in that they are bound to exercise powers and authorities within limits prescribed by an established legal framework.