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 Sunni Islamic saint, and some of the largest and most widespread included the 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]), and 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, 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."