Methods of converting Iran
Ismail consolidated his rule over the country and launched a thorough and at times brutal campaign to convert the majority Sunni population to Twelver Shiism and thus transform the religious landscape of Iran.[14] His methods of converting Iran included:
 Imposing Shiism as the state and mandatory religion for the whole nation and much forcible conversions of Iranian Sufi Sunnis to Shiism.
 He reintroduced the Sadr (Arabic, leader) – an office that was responsible for supervising religious institutions and endowments. With a view to transforming Iran into a Shiite state, the Sadr was also assigned the task of disseminating Twelver doctrine
 He destroyed Sunni mosques. This was even noted by Tomé Pires, the Portuguese ambassador to China who visited Iran in 1511–12, who when referring to Ismail noted: "He (i.e. Ismail) reforms our churches, destroys the houses of all Moors who follow (the Sunnah of) Muhammad…"[19]
 He enforced the ritual and compulsory cursing of the first three Sunni Caliphs (Abu Bakr, Umar, and Uthman) as usurpers, from all mosques, disbanded Sunni Tariqahs and seized their assets, used state patronage to develop Shia shrines, institutions and religious art and imported Shia scholars to replace Sunni scholars.[20][21][22]
 He shed Sunni blood and destroyed and desecrated the graves and mosques of Sunnis. This caused the Ottoman Sultan Bayezid II (who initially congratulated Ismail on his victories) to advise and ask the young monarch (in a “fatherly” manner) to stop the anti-Sunni actions. However, Ismail was strongly anti-Sunni, ignored the Sultan's warning, and continued to spread the Shia faith by the sword.[23][24]
 He persecuted, imprisoned and executed stubbornly resistant Sunnis.[25][26]
 With the establishment of Safavid rule, there was a very raucous and colourful, almost carnival-like holiday on 26 Dhu al-Hijjah (or alternatively, 9 Rabi' al-awwal) celebrating the murder of Caliph Umar. The highlight of the day was making an effigy of Umar to be cursed, insulted, and finally burned. However, as relations between Iran and Sunni countries improved, the holiday was no longer observed (at least officially).[27]
 In 1501 Ismail invited all the Shia living outside Iran to come to Iran and be assured of protection from the Sunni majority.[28]