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. While in the 1940s Khomeini accepted the idea of a limited monarchy under the Iranian Constitution of 1906–07 – 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 "" ("Hokumat-e Islami: Velayat-e faqih").