and most widespread included the Suhrawardiyya (after Abu al-Najib Suhrawardi [d. 1168), Qadiriyya (after Abdul-Qadir Gilani [d. 1166]), the Rifa'iyya (after Ahmed al-Rifa'i [d. 1182]), the Chishtiyya (after Moinuddin Chishti [d. 1236]), the Shadiliyya (after Abul Hasan ash-Shadhili [d. 1258]), the Hamadaniyyah (after Sayyid Ali Hamadani [d. 1384], the Naqshbandiyya (after Baha-ud-Din Naqshband Bukhari [d. 1389]). Contrary to popular perception in the West, however, neither the founders of these orders nor their followers ever considered themselves to be anything other than orthodox Sunni Muslims, and in fact all of these orders were attached to one of the four orthodox legal schools of Sunni Islam. Thus, the Qadiriyya order was Hanbali, with its founder, Abdul-Qadir Gilani, being a renowned jurist; the Chishtiyya was Hanafi; the Shadiliyya order was Maliki; and the Naqshbandiyya order was Hanafi. Thus, it is precisely because it is historically proven that "many of the most eminent defenders of Islamic orthodoxy, such as Abdul-Qadir Gilani, Ghazali, and the Sultan Ṣalāḥ ad-Dīn (Saladin) were connected with Sufism" that the popular studies of writers like Idries Shah are continuously disregarded by scholars as conveying the fallacious image that "Sufism" is somehow distinct from "Islam." Nile Green has observed that, in the Middle Ages, Sufism more or less was Islam. Growth of influence Historically, Sufism became "an incredibly important part of Islam" and "one of the most widespread and omnipresent aspects of Muslim life" in Islamic civilization from the early medieval period onwards, when it began to permeate nearly all major aspects of Sunni Islamic life in regions stretching from India and Iraq to the Balkans and Senegal. The rise of Islamic civilization coincides strongly with the spread of Sufi philosophy in Islam. The spread of Sufism has been considered a definitive factor in the spread of Islam, and in the creation of integrally Islamic cultures, especially in Africa and Asia. The Senussi tribes of Libya and the Sudan are one of the strongest adherents of Sufism. Sufi poets and philosophers such as Khoja Akhmet Yassawi, Rumi, and Attar of Nishapur (c. 1145 – c. 1221) greatly enhanced the spread of Islamic culture in Anatolia, Central Asia, and South Asia. Sufism also played a role in creating and propagating the culture of the Ottoman world, and in resisting European imperialism in North Africa and South Asia. Between the 13th and 16th centuries, Sufism produced a flourishing intellectual culture throughout the Islamic