[As early as in the time of Sultan Iltutmish (1210-1236), soon after the establishment of the Delhi Sultanate in 1206, some Ulama suggested to him to… - Iltutmish

Tomb of Sultãn Ghãrî: Sayyid Ahmad Khãn notices this tomb and describes it as exquisite. He says that it was built in AH 626 corresponding to AD 1228 when the corpse of Sultãn Nãsiru’d-Dîn Mahmûd, the eldest son of Sultãn Shamsu’d-Dîn Iltutmish, who was Governor of Laknauti and who died while his father was still alive, was brought to Delhi and buried.391 But the editor, Khaleeq Anjum, comments in his introduction that “the dome of the mosque which is of marble has been re-used and has probably been obtained from some temple”, and that the domes on the four pavilions outside “are in Hindu style in their interior.”392 He provides greater details in his notes at the end of Sayyid Ahmad’s work. He writes: “…This is the first Muslim tomb in North India, if we overlook some others. And it is the third historical Muslim monument in India after Quwwat al-Islãm Masjid and ADhãî Din Kã JhoñpRã… Stones from Hindu temples have been used in this tomb also, as in the Quwwat al-Islãm Masjid.” “…In the middle of the corridor on the west there is a marble dome. A look at the dome leads to the conclusion that it has been brought from some temple. The pillars that have been raised in the western corridor are of marble and have been made in Greek style. It is clear that they belong to some other building…”

That the practice of utilizing the spoils of Hindu temples continued throughout the reign of Sultan Iletmish is proved by the Mosque of Ukha in Bayana (Uttar Pradesh), which is also on the site of a Hindu temple…

Iltutmish did not forget that he was a Muslim conqueror. He showed himself to be very pious, never forgetting to do his five devotional daily….He likewise showed himself totally intolerant vis-à-vis the Hindus who refused to convert, destroying their temples and annihilating Brahmin communities.