Considered one of the great saints in the Chishtiya lineage in India. His Dargha complex and Mazar in the Mehroli district of Delhi is a point of pilgrimage for many who come to India and from all parts of India.
The following is from the Aulia-e-Hind website, a very good source of information about the Sufi Saints of India and all over the world.
Qutbuddin Bakhtiar Kaki was a renowned Muslim Sufi mystic, saint and scholar in the Chishti Order from Delhi, India. He was the disciple and khalifa (spiritual successor) of Moinuddin Chishti as head of the Chishti Order. His most famous disciple and spiritual successor was Baba Fareed.
Khwaja Qutbuddin Bakhtiyar Kaki was born in 569 A.H. (1173 C.E.) in a town called “Aush” or Awash in Mawar-un-Nahar (Transoxania). Khwaja Qutbuddin’s original name was “Bakhtiyar” but his title was “Qutbuddin”. The name “Kaki” to his name was attributed to him by virtue of a miracle that emanated from him at a later stage of his life in Delhi. He also belonged to the direct lineage of the Holy Muhammad, descending from [[Husayn ibn Ali|Hussain Bin Ali). Khawaja Bakhtiyar Khaki was one and half years old when his father died. His mother arranged for him very good education and training.
When Khawaja Moinuddin Chishti went to Isfahan, 40 days before his demise, he took oath of allegiance at his hands and received the Khilafat and Khirqah (Sufi cloak) from him. Thus, he was the first spiritual successor of Khawaja Gharib Nawaz, Khawaja Moinuddin Chishti r.a. Thereafter, his spiritual master asked him to go to India and stay there.
When Khwaja Qutbuddin r.a. intended to kiss the feet of his Pir and Murshid and seek his permission to depart, Khwaja Moinuddin understood it and asked him to be nearer, and when Khwaja Bakhtiyar stepped up and fell at his Pir’s feet, Khawaja Moinuddin raised him up and embraced him affectionately. A Fateha was then recited and Khwaja Moinuddin advised his Murid: “Never turn your face from the right path of Sufism and Truth. Prove yourself to be a brave man in this Divine Mission.” When he again fell at the feet of Khwaja Moinuddin overwhelmed with love and grief at this tragic hour of parting, he was again raised and embraced affectionately by his Pir. Following this order, he went to Delhi and stayed there. It was the period of Sultan Shamsuddin Iltutmish.
Hardly twenty days had passed when news was brought by a messenger that Khawaja Moinuddin disappeared into the eternal Divine bliss of the Almighty Allah.
Khwaja Bakhtiyar Kaki used to offer 95 Rakats of Salah [sections of prayer] during the 24 hours of day and night, along with 3000 Durud Sharifs [a part of prayer] every night upon the soul of the Holy Prophet s.a.w.s. During the first 3 nights of his first marriage, he could not maintain the Durud Sharif. The Holy Prophet s.a.w.s. sent a visionary message to a pious person named Rais Ahmed, asking Hazrat Bakhtiyar Kaki r.a. the reasons for his not reciting the Durud Sharif. Hazrat Bakhtiyar Kaki r.a. divorced his wife forthwith as a mark of repentance and thereafter broke off all worldly ties and devoted his full time to the devotion of God.
It is narrated that in the early stages of his life, Hazrat Khwaja Qutbuddin r.a. would take a nap, but in the last part of his life he kept awake all the time. He had also committed the Quran to memory and used to recite and finish it twice daily. Whenever anything came to his Khanqah, he quickly distributed these to the poor and needy. If there were nothing, he would request his attendants and mureeds to distribute plain water as a humble token of his hospitality.
Sheikh Nur Bux has written in his book entitled “Silsila tuz’zah”: “Bakhtiyar Aushi was a great devotee, mystic and friend of God. In private and public he was indulged in the remembrance of God. He was habituated to eat little, sleep little and speak little. He was a towering personality in the world of mysticism.”
He had no parallel in abandoning the world and suffering poverty and hunger. He kept himself engrossed in the remembrance of Allah. Whenever someone came to him he would come back to his senses after a while and was then able to talk with him. After a very brief exchange he would show his inability to continue any longer and slipped into the same state of absorption once again.
Once Hazrat Khwaja Qutbuddin was coming back with his relatives and disciples after offering Eid Salah [Eid prayers] that he, all on a sudden, halted at a place in silence. After a while his relatives submitted: “Today is the Eid day. Many people would be awaiting his arrival.” Having heard this Hazrat Khwaja r.a. came out of his lost state and uttered, “From this piece of land I have the smell of the perfect men.”
Thereafter, he came home and after the meal was over, he asked the people to call the owner of the land to him. When the owner came to him, he purchased that piece of land from him. Later, Hazrat Bakhtiyar r.a. was buried in the same soil.
Death also came to him in an unusual manner. It is stated that once in an assembly of Sama [religious music] he happened to hear a verse of Hazrat Ahmad Jam with the meaning: “Those who are killed with the dagger of surrender and pleasure get a new life from the Unseen.”
Hazrat Khwaja Bakhtiyar Kaki r.a. was so much absorbed in and inspired with this verse that from that day on he kept on reciting it in a state of unconsciousness and gave his life in the same state. He remained in this state of Wajd for 3 consecutive days and expired on the 4th day. He died on the 14th of Rabi-ul-Awwal 633 A.H. On account of his extraordinary death, Hazrat Khwaja Qutbuddin Bakhtiyar Kak ir.a. is known as “Shahid-e-Mohabbat” or Martyr of Allah’s Love.
The Mazaar Sharif [noble tomb] of Hazrat Khwaja Qutbuddin Bakhityar Kaki r.a. lies near Qutub Minar at Mehroli, India.
He also enjoys the following titles in the Sufi world: Qutub-ul-Aqtaab, Malik-ul-Mashaa’ikh, Rais-us-Saalikin, Siraj-ul-Auliya, etc.