

Gilani belonged to the Shafi'i and Hanbali schools of law. He spent twenty-five years wandering in the deserts of Iraq. After completing his education, Gilani left Baghdad. His Sufi spiritual instructor was Abu'l-Khair Hammad ibn Muslim al-Dabbas. He studied Hadith with Abu Muhammad Ja'far al-Sarraj.

There, he pursued the study of Hanbali law under Abu Saeed Mubarak Makhzoomi and ibn Aqil. Gilani spent his early life in Gilan, the province of his birth. Gilani's mother, Ummul Khair Fatima, was also a Sayyid, but of the Husaynid branch having been a descendant of Muhammad al-Jawad, who was said to be descended from Husayn ibn Ali, the younger brother of Hasan. "fight-lover" in Farsi) in the Iranic-speaking world, his father's sobriquet. Abu Saleh was respected as a Wali by the people of his day, and was known as Jangi Dost (lit. Gilani's father, Abu Saleh, was from a Hasanid Sayyid lineage, tracing his descent from Hasan ibn Ali, a grandson of the Islamic prophet Muhammad, making him a member of Banu Hashim. However, Gilani also carried the epithet Baghdadi, referring to his residence and burial in Baghdad. Gilani ( Arabic al-Jilani) refers to his place of birth, Gilan. The honorific Muhiyudin denotes his status with many Sufis as a "reviver of religion". He was born on Ma(1 Ramdhan 470 AH) in the town of Na'if, Rezvanshahr in Gilan, Iran, and died on Febru(11 Rabi' al-Thani 561 AH), in Baghdad.

Abū Sāliḥ ʿAbd al-Qādir al-Jīlānī al-Baḡdādī al-Ḥasanī al-Ḥusaynī (March 23, 1078 – February 21, 1166), was a Sunni Muslim preacher, ascetic, mystic, jurist, and theologian belonging to the Hanbali, and the eponymous founder of the Qadiriyya tariqa (Sufi order) of Sufism. Miniature from Ottoman (1595) edition of "Nafahat al-uns" (Breaths of Fellowship) of Jami. The Vision of Muhyi al-Din ibn al-Gilani.
