That men imbued with Sufi doctrines early came to India there cannot be the slightest doubt ; but who these earliest comers were, or when they arrive… - Murray Thurston Titus

"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 '.

In the year A.D. 1202, when Qulb-ud-Din captured Kalinjar, after the temples had been convened into mosques, and the very name of idolatry was annihilated, fifty thousand men came under the collar of slavery and the plain became black as pitch with Hindus.

Qutb-ud-Din Aybak also is said to have destroyed nearly a thousand temples, and then raised mosques on their foundations. The same author states that he built the Jami Masjid, Delhi, and adorned it with the stones and gold obtained from the temples which had been demolished by elephants, and covered it with inscriptions (from the Quran) containing the divine commands. We have further evidence of this harrowing process having been systematically employed from the inscription extant over the eastern gateway of this same mosque at Delhi, which relates that the materials of 27 idol temples were used in its construction.