Who was a famous Persian Sufi who lived in the 11th century in Herat who's works refer to a particularly important group of God's saints?
Abdal: Abdāl ("lit": substitutes, but which can also mean "generous" ["karīm"] and "noble" ["sharīf"]) is a term used in Islamic metaphysics and Islamic mysticism, both Sunni and Shiite, to refer to a particularly important group of God's saints. Khwaja Abdullah Ansari: Hazrat Shaikh Abu Ismaïl Abdullah al-Herawi al-Ansari or Khajah Abdullah Ansari of Herat (1006–1088) (Persian: خواجه عبدالله انصاری‎ ‎ ) also known as "Pir-i Herat" (پیر هرات ) (sage of Herat) was a famous Persian Sufi who lived in the 11th century in Herat (then Khorasan, now Herat province, Afghanistan).
Khajah Abdullah Ansari