Muammar Muhammad Abu Minyar al-Gaddafi (Arabic: معمر محمد أبو منيار القذافي‎) (June 1942 – 20 October 2011), commonly known as Muammar Gaddafi  /ˈmoʊ.əmɑr ɡəˈdɑːfi/ (Arabic: مُعَمَّر القَذَّافِي‎ Muʿammar al-Qaḏḏāfī  audio (help·info)) or Colonel Gaddafi, was the official ruler of the Libyan Arab Republic from 1969 to 1977 and then the "Brother Leader" of the Libyan Arab Jamahiriya from 1977 to 2011. Gaddafi seized power in a bloodless military coup in 1969 and served as the country's head of state until 1977, when he stepped down from his official executive role as Chairman of the Revolutionary Command Council of Libya, and claimed subsequently to be merely a symbolic figurehead. He styled himself as "Leader of the Revolution"; in 2008 a meeting of traditional African rulers bestowed on him the title "King of Kings". A leading advocate for a United States of Africa, he served as Chairperson of the African Union (AU) from 2 February 2009 to 31 January 2010.

Gaddafi replaced the Libyan Constitution of 1951 with laws based on the political ideology he had formulated, which he called the Third International Theory and published in The Green Book. After establishing the Jamahiriya (جماهيرية, "state of the masses") system in 1977, he officially stepped down from power and after that time held a largely symbolic role within the country's official governance structure. Rising oil prices and extraction in Libya led to increasing revenues. By exporting as much oil per capita as Saudi Arabia and through various welfare programs, Libya achieved the highest living standards in Africa; Libya remained debt-free.