Abdul Qadir al-Jilani was a prominent Islamic scholar and Sufi mystic born in 1077 in Jilan, Persia. He is best known for founding the Qadiriyya order, one of the oldest Sufi brotherhoods, which emphasizes spiritual development and devotion to Allah. Al-Jilani's teachings focused on the importance of inner purification and the pursuit of a direct relationship with God. He spent much of his life in Baghdad, where he gained a large following due to his eloquent sermons and profound spiritual insights. Al-Jilani is also credited with numerous writings, including the famous work "Futuh al-Ghaib," which explores themes of divine love and guidance. His legacy continues to influence Sufi thought and practice today.