1009-1072/77), known as ?Ali al-Hujwiri or al-Hujwiri (also spelt Hajweri, Hajveri, or Hajvery) for short, or reverentially as Shaykh Syed ?Ali al-Hujwiri or as Data Ganj Bakhsh by Muslims of the Indian subcontinent, was an 11th-century Iranian Sunni Muslim mystic, theologian, and preacher from Ghazna, who became famous for composing the Kashf al-ma?jub (Unveiling of the Hidden), which is considered the "earliest formal treatise" on Sufism in Persian.
Ali Hujwiri is believed to have contributed "significantly" to the spread of Islam in South Asia through his preaching, with one historian describing him as "one of the most important figures to have spread Islam in the Indian subcontinent."In the present day, Ali Hujwiri is venerated as the patron saint of Lahore, Pakistan by the traditional Sunni Muslims of the area.
He is, moreover, one of the most widely venerated saints in the entire Indian subcontinent, and his tomb-shrine in Lahore, popularly known as Data Darbar, is one of the most frequented shrines in South Asia.
At present, it is Pakistan's largest shrine "in numbers of annual visitors and in the size of the shrine complex," and, having been nationalized in 1960, is managed today by the Department of Awqaf and Religious Affairs of the Punjab.
The mystic himself, remains a "household name" in the daily Islam of both India and Pakistan.
In 2016, the Government of Pakistan declared 21 November to be a public holiday for the commemoration of the commencement of Ali Hujwiri's three-day death anniversary.