As Roman emperor, Septimius Severus (r.193–211) was responsible for initiating an extensive building program at his native Leptis Magna. Muhammad bin 'Ali as-Sanusi (1780?–1859), the founder of the Sanusi order, established its headquarters in Cyrenaica in the 1840s. Muhammad Idris al-Mahdi as-Sanusi (1890–1983), his descendant, was Libya's first king, ruling the country from its independence until he was deposed in 1969. Col. Mu'ammar Muhammad al-Qadhafi (b.1942) became the actual ruler of the country at that time. Omar al-Muntasser (b.1939) became secretary-general of the General People's Committee in 1987.