Published on 06 Jan 2012 | over 4 years ago
Al-Syed Muhiyudin Abu Muhammad Abdal Qadir Amoli al-Gilani al-Hasani wal-Hussaini , (Persian: عبد القادر گیلانی,Urdu: عبد القادر آملی گیلانی Abdolqāder Gilāni) (also spelled Abdulqadir Gaylani, Abdelkader, Abdul Qadir, Abdul Khadir - Jilani, Jeelani, Jilali, Gailani, Gillani, Gilani, Al Gilani) (470--561 AH) (1077--1166 CE) was a Persian Islamic preacher who is highly esteemed by sunni scholars. Among followers in Pakistan and India, he is also known as Ghaus-e-Azam. He was born on a Wednesday the 10th Rabi al-Thani in 470 AH, 1077 CE, in the Persian province of Mazandaran (Iran) south of the Caspian Sea.
Abdul-Qadir ibn Abi Salih Musa ibn Abdullah ibn Yahya ibn Muhammad ibn Abu Muhammad AbuBakr Dawud ibn Musa ibn Abdullah ibn Musa Jawni ibn Abdullah ibn Hassan al-Muthanna ibn Hassan ibn Ali ibn Abi Talib, and this on his father side so you can see why they call him al-Hassani due to his tracing up to Muhammad's grandson Hassan ibn Ali. On his mother side, she is the daughter of a saintly person Abdullah Sawmai who was a direct descendant of Imam Husain ibn Ali making the Shaykh also al-Husayni due to this.
Al-Gilani was born in 1078 CE (471 AH) in a small town of Iranian Gilan Province. His ancestors were Syeds who settled in Gilan (arabacized to Jilan) hence the epiphet of al-Jilani.
" Sayyid Abu Muhammad Abdul Qadir R.A was born in Naif in the District of Gilan in Persia (Iran) in the month of Ramadan....His father's name was Abu Salih, a God-fearing man and a direct descendant of Hazrat Imam Hasan R.A., the eldest son of Ali R.A, the Holy Prophet's (SAW) first cousin, and of Fatima R.A his beloved daughter. His mother was the daughter of a saintly person- Abdullah Sawmai who was a direct descendant of Imam Husain R.A, the younger son of Ali R.A and Fatima R.A. Thus Sayyid Abdul Qadir was both a Hasani and Hussaini "
His complete name Al-Syed Muhiyudin Abu Muhammad Abdal Qadir al-Jilani al-Hasani wal-Hussaini, Syed denoting his honorific title of descendancy from the Islamic prophet Muhammad, Muhiyudin his title for being known popularly as "the reviver of religion", al-Jilani denoting the region he hailed from although however he also had the epiphet al-Baghdadi.  (denoting also the city of Baghdad where he was now residing in and therefore also geographically recognised through, eventually being buried there), and al-Hasani wal-Hussaini affirming his lineal descent from both Syed Imam Hasan and Imam Hussain, the grandsons of Muhammad.
His father, Syed Abu Saleh Musa al-Hasani was a direct descendant of the Syed Imam Hasan. He was an acknowledged saint of his day "..and was popularly known as Jangi Dost, because of his love for Jihad" Jangi dost thereby being his sobriquet
His mother Ummal Khair Fatima, daughter of Syed Abdullah Sawmai az-Zaid a descendant of Syed Imam Hussain through Imam Zain ul Abideen, he was known as a "great saint of his time and a direct descendant of Hazrat Imam Husain, the Great Martyr of Karbala"
The sheikh visal on Saturday night 1166 (11 Rabi' sitani 561AH)  at the age of ninety one years (by the Islamic calendar), and was entombed in a shrine within his Madrassa in Baghdad. His Shrine and Mosque are in what used to be the school he preached in, located in Babul-Sheikh, Resafa (East bank of the Tigris) in Baghdad, Iraq. Worldwide the Sufi orders celebrate Ghouse-al-azham day on 11th al-thani closest to his birthday not his death-date for respect and elevation of their Shaykh which is 10th of Rabi at-Thani in the islamic calendar
Al-Gilani succeeded the spiritual chain of Junayd Baghdadi. His contribution to thought in the Muslim world earned him the title Muhiyuddin (lit. "The reviver of the faith"), as he along with his students and associates laid the groundwork for the society which later produced stalwarts like Nur ad-Din and Saladin.