Baudouin was King of the Belgians from 17 July 1951 until his death in 1993. He was the last Belgian king to be sovereign of the Congo, before it became independent in 1960 and became the Democratic Republic of the Congo.

Belgium is a constitutional, hereditary and popular monarchy. The monarch is titled King of the Belgians and serves as the country's head of state and commander-in-chief of the Belgian Armed Forces. There have been seven Belgian monarchs since independence in 1830.