Muammar Gaddafi became the de facto leader of Libya on 1 September 1969 after leading a group of young Libyan Army officers against King Idris I in a bloodless coup d'état. After the king had fled the country, the Revolutionary Command Council (RCC) headed by Gaddafi abolished the monarchy and the old constitution and established the Libyan Arab Republic, with the motto "freedom, socialism and unity". The name of Libya was changed several times during Gaddafi's tenure as leader. From 1969 to 1977, the name was the Libyan Arab Republic. In 1977, the name was changed to Socialist People's Libyan Arab Jamahiriya. Jamahiriya was a term coined by Gaddafi, usually translated as "state of the masses". The country was renamed again in 1986 as the Great Socialist People's Libyan Arab Jamahiriya, after the United States bombing that year.

Muammar Muhammad Abu Minyar al-Gaddafi was a Libyan revolutionary, politician and political theorist who ruled Libya from 1969 until his assassination by rebel forces in 2011. He first served as Revolutionary Chairman of the Libyan Arab Republic from 1969 to 1977 and then as the Brotherly Leader of the Great Socialist People's Libyan Arab Jamahiriya from 1977 to 2011. Initially ideologically committed to Arab nationalism and Arab socialism, Gaddafi later ruled according to his own Third International Theory.