 Nor do Islamists agree on when true and original Islam was in existence.Abul Ala Maududi indicates it was the era of the Prophet and the 30-year reign of the four "rightly guided caliphs" ("Rashidun").Qutb's brother Muhammad thought the only time "Islam was ... enforced in its true form" was for fifteen years, during the first two caliphs, plus three years from 717 to 720 A.D. For the Shiite Ayatollah Khomeini, the five-year reign of Caliph Ali was the truly Islamic era Muslims should imitate.