By the late 1960s, Khomeini was a marja-e taqlid (model for imitation) for “hundreds of thousands” of Shia, one of six or so models in the Shia world.[58] While in the 1940s Khomeini accepted the idea of a limited monarchy under the Persian Constitution of 1906 – as evidenced by his book Kashf al-Asrar – by the 1970s he had rejected the idea. In early 1970, Khomeini gave a series of lectures in Najaf on Islamic government, later published as a book titled variously Islamic Government or Islamic Government: Governance of the Jurist (Hokumat-e Islami: Velayat-e faqih). This principle, though not known to the wider public before the revolution, was appended to the new Iranian constitution after the revolution.