Ali ibn Sahl Isfahani explained

Abolhassan Ali ebn-e Sahl Azhar Esfahani was a Persian mystic. He lived in the era of Abbasid Caliph Al-Mu'tadid and died in 894 in Isfahan. According to Spencer, he founded the first khanqah. His khanqah still exists and is also his mausoleum.^[1]

Notes and References

1. Web site: خانقاه و مقبره علی ابن سهل.