Question: 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?
Sentence (from "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).
Relevant evidence: Yes