Daata Ali Hajwayri رَحْمَۃُ اللہِ تَعَالٰی عَلَیْہِ was a Persian Sufi and scholar in the 11th century. He significantly contributed to the spreading of Islam in South Asia. He was born around 990 CE near Ghazni, present day Afghanistan, during the Ghaznavid Empire and died in Lahore (in present-day Punjab, Pakistan) in 1077 CE. His most famous work is Revelation of the Veiled (Kashf Al Mahjub) (کشفُ المحجوب), written in the Persian language. The work, which is one of the earliest and most respected treatises of Sufism, debates Sufi doctrines of the past. He is also famous for his mausoleum in Lahore, which is surrounded by a large marble courtyard, a mosque and other buildings. It is the most frequented of all the shrines in that city, and one of the most famous in Pakistan and nearby countries.