 The Suhrawardiyyah order of Sufism gained popularity in Bengal.In addition, the Suhrawardiyyah order, under the leadership of Abu Hafs Umar al-Suhrawardi (d. 1234), also bequeathed a number of teachings and institutions that were influential in shaping other order that emerged during later periods.The Khalwati order was founded by Umar al-Khalwati, an Azerbaijani Sufi known for undertaking long solitary retreats in the wilderness of Azerbaijan and northwestern Iran.