Shaikh Abd al-Qadir al-Jilani was born in 470 H (1077 CE) in Gaylan in present-day northern Iran. At the age of eighteen, he emigrated to Baghdad to study, beginning a journey destined to be a unique spiritual odyssey. He spent almost three decades as a wandering Sufi throughout Iraq, before settling in Baghdad. In 521 H (1127), his teacher, Shaikh Abu Said al-Makhzumi, turned over his school to him. Shaikh Abd al-Qadir lectured there three days a week, with his lectures attracting thousands of people. Some students wrote down his sermons, preserving his words for later generations. Some of Shaikh Abd al-Qadir's sermons were compiled in the books ""al-Fath al-rabbani"" and ""Jila al-khatir."" His other famous works include ""Futuh al-ghayb"" and ""al-Ghunya li-talibi al-haqq."" He also left poems, wirds (litanies), prayers on the Prophet (PBUH), and supplications.It is impossible to overstate the role of Shaikh Abd al-Qadir in disseminating the spiritual culture of Islam, in its two inseparable theoretical and practical dimensions. His efforts to cultivate an understanding of the spiritual depth of Islam-as set out in the Qur'an and detailed in the Sunna-had a profound impact on endearing the message of the Prophet Muhammad (PBUH) to people and spreading its reach.