Khomeini was a marja (“source of emulation”) in Twelver Shia Islam, a Mujtahid or faqih (an expert in Islamic law) and author of more than 40 books, but he is primarily known for his political activities. He spent more than 15 years in exile for his opposition to the last Shah.
In his writings and preachings he expanded the theory of welayat-el faqih, the “Guardianship of the Islamic Jurist (clerical authority)”, to include theocratic political rule by Islamic jurists. This principle (though not known to the wider public before the revolution), was appended to the new Iranian constitution after being put to a referendum.
