Photograph of Iron Pillar in the Qutb Minar complex in Delhi from 'Murray Collection: Views in Delhi, Cawnpore, Allahabad and Benares' taken by Dr. John Murray in 1858 after the Uprising of 1857. The Qutub Minar complex was initiated by Qutub-ud-din Aibak, the founder of the Slave Dynasty in Delhi (1206-90), to celebrate the onset of Islamic rule in India in 1192. The Iron Pillar, with a height of 7.2 m and diameter of 32 cm, is dated to the Gupta period with Sanskrit inscriptions from the 4th or 5th century. This pillar was taken from a Vishnu temple and placed at this site before the construction of the complex. The Quwwat-ul-Islam mosque, in the background, contained within the complex is one of the earliest extant in India and is a fine example of Islamic architecture employing Islamic principles of accurate construction and geometric ornamentation, but utilising Indian building traditions.