Abu'l-Hasan ( c. 1569 – 12 June 1641) entitled by the Mughal emperor Jahangir as Itiqad Khan in 1611 and Asaf Khan in 1614, was the Grand Vizier (Prime Minister) of the fifth Mughal emperor Jahangir , a position he held from the time of death of Mirza Ghiyas Beg till the accession of Shah Jahan . He previously served as the vakil (the highest Mughal administrative office) of Jahangir. Asaf Khan is perhaps best known for being the father of Arjumand Banu Begum (better known by her title Mumtaz Mahal ), the chief consort of Shah Jahan and the older brother of Empress Nur Jahan , and the maternal grandfather of mughal emperor Aurangzeb .