Hazrat Sheikh Abul Hassan Ali Ibn Usman al-Jullabi al-Hajvery al-Ghaznawi, or Abul Hassan Ali Hajvery (sometimes also spelt as Hujwiri, Hajweri, Hajveri), more popularly known as Hazrat Daata Ganj Bakhsh (Persian/Punjabi, lit. The master who bestows treasures) or even simply as Daata Sahib (Persian/Urdu), was a famous Afghan Sufi mystic, saint and scholar during the 11th century. He made a significant contribution both to the spreading of Islam in South Asia and to promoting a more liberal, tolerant society in the region.