The Fourth Sultan-ul-Faqr Hazrat Shaikh Abdul Razzaq Jillani Rehmat-ul-Allah Alayh is the son of Ghaus-ul-Azam Shaikh Abdul Qadir Jillani Razi Allah Anhu. He had been blessed with the Faqr of Ghaus-ul-Azam through blood as well as soul. Ghaus-ul-Azam Shaikh Abdul Qadir Jillani Razi Allah Anhu transferred all his spiritual knowledge and powers to his son, so he was the mirror image of his father.
Hazrat Shaikh Abdul Razzaq Rehmat-ul-Allah Alayh was born in 528H (1133 A.D) in Baghdad. He was not only brought up in the sacred hands of the king of Faqr Hazrat Ghaus-ul-Azam Razi Allah Anhu, but also got religious and spiritual education, persuasion and guidance from him. He also benefited from the other scholars of his time.
Allama Ibn-e-Najjar writes about him that "he got the knowledge of Hadith from his father and also from a very learned group of scholars, he also acquired much knowledge due to his own intellect and hard work". Being a great jurist and scholar of Hadith he got the title of "Taj-ud-Din" meaning "the crown of religion".
Humbleness, endurance, morality, modesty and dignity were some of his prominent attributes. He was also known for his piousness, virtuous deeds, abstinence and mysticism. He usually liked solitude and spent most of his time in prayers and invocations, he only met people for delivering sermons and lectures. A large number of people benefited from him and many of them became great scholars and perfect mystics. Hafiz Ammad-ud-Din Ibn-e-Katheer writes, "Hazrat Pir Abdul Razzaq Rehmat-ul-Allah Alayh was perfectly accomplished mystic, ascetic and pious person. No one among the children of Hazrat Shaikh Abdul Qadir Jillani Razi Allah Anhu was more learned and accomplished than him. He rejected worldly riches, status and high posts. He was least interested in worldly pleasures and always looked forward to the hereafter. He listened and learned Hadith from many scholars and many people learned Hadith from him".
A tradition of Hazrat Abu Zura'a Zahir Bin Al-Muqqadas Al-Dari is related in "Bahijjat-ul-Asrar" about the great love of Shaikh Abdul Razzaq Jillani with Almighty Allah and his grand status of Divine propinquity. He states that once he was present in the sermon of Ghaus-ul-Azam Razi Allah Anhu. During the sermon he said, "today a few such people are also present here who live across the mountain of Qa'f Qudas, their foot steps are in the air, their cloaks and the crowns of love of Allah on their heads are burning due to the extreme fire of Divine passion". Shaikh Abdul Razzaq was sitting close to the chair of Ghaus-ul-Azam Razi Allah Anhu, listening these words of him he rose his head and gazed at the sky, in a moment his cloak and turban started burning and he fainted. Hazrat Ghaus-ul-Azam Razi Allah Anhu rose up and put the fire out with his hands saying "Oh Abdul Razzaq you are also one of them". Abu Zura'a says that "after the sermon I asked Shaikh Abdul Razzaq about the incident. He told that when he gazed at the sky he saw some celestial spiritual people in the air whose cloaks and turbans were blazing with the extreme fire of Divine passion and they were circling and dancing in the air, they were thundering like clouds with the ache of Divine love. Seeing them he also felt the same".
Shaikh Abdul Razzaq Jillani Rehmat-ul-Allah Alayh passed on the Trust of Faqr to his grand son Shaikh Abdul Jabbar Jillani Rehmat-ul-Allah Alayh.
There is a contradiction in the date of his death. Some has written Shawal 603H and some say that it is Rabi-ul-Awal 571H. His tomb is besides the tomb of Imam Ahmad Bin Humble Rehmat-ul-Allah Alayh near Baab-e-Harm in Baghdad. Both these tombs have become extinct due to the flow of river Dajla.
Hazrat Shaikh Abdul Razzaq Rehmat-ul-Allah Alayh has also written a book "Jala-ul-Khawatir".