He then marched and encamped under the fort of Delhi... The city and its vicinity were freed from idols and idols-worship, and in the sanctuaries of … - Qutb-ud-din Aibak

"Qutb-ud-Din, whose reputation for destroying temples was almost as great as that of Muhammad, in the latter part of the twelfth century and early years of the thirteenth, must have frequently resorted to force as an incentive to conversion. One instance may be noted: when he approached Koil (Aligarh) in A. D. 1194, ' those of the garrison who were wise and acute were converted to Islam, but the others were slain with the sword '.

For instance, when Muhammad Ghauri and Qutbuddin Aibak mounted a combined attack on the Khokhars of the Salt Range (Koh-i-Jud), “great plunder was taken and many captives, so that five Hindu [Khokhars] captives could be bought for a dinar”. Captives were so plentiful that they were also sent “to sell in Khurasan, not long after.”

The congregational mosque at Delhi named, purposefully, as the Masjid Quwwatul Islam (Might of Islam), was commenced by Aibak in 592/1195 within two years of its conquest. It was built with materials and gold obtained by destroying 27 Hindu and Jain temples in Delhi and its neighbourhood. A Persian inscription in the mosque testifies to this. The mosque at Ajmer erected by Qutbuddin Aibak soon after its occupation and known as the Arhai din ka Jhonpra, was also built from materials obtained from demolished temples. The Qutb Minar, planned and commenced by Aibak sometime in or before 1199 and completed by Iltutmish, was also constructed with similar materials, “the sculptured figures on the stones being either defaced or concealed by turning them upside down.” “In this improvisation,” rightly observes Habibullah, “was symbolised the whole Mamluk history”.