Abdul-Qadir Gilani
In the eleventh-century, Sufism, which had previously been a less "codified" trend in Islamic piety, began to be "ordered and crystallized" into orders which have continued until the present day. All these orders were founded by a major Islamic scholar, and some of the largest 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."