“Hasan Nizami writes that after the suppression of a Hindu revolt at Kol (Aligarh) in 1193 AD, Aibak raised “three bastions as high as heaven with their heads, and their carcases became food for beasts of prey. The tract was freed from idols and idol-worship and the foundations of infidelism were destroyed.” In 1194 AD Aibak destroyed 27 Hindu temples at Delhi and built the Quwwat-ul-Islãm mosque with their debris. According to Nizami, Aibak “adorned it with the stones and gold obtained from the temples which had been demolished by elephants”. In 1195 AD the Mher tribe of Ajmer rose in revolt, and the Chaulukyas of Gujarat came to their assistance. Aibak had to invite re-inforcements from Ghazni before he could meet the challenge. In 1196 AD he advanced against Anahilwar Patan, the capital of Gujarat. Nizami writes that after Raja Karan was defeated and forced to flee, “fifty thousand infidels were despatched to hell by the sword” and “more than twenty thousand slaves, and cattle beyond all calculation fell into the hands of the victors”. The city was sacked, its temples demolished, and its palaces plundered. On his return to Ajmer, Aibak destroyed the Sanskrit College of Visaladeva, and laid the foundations of a mosque which came to be known as ADhãî Din kã JhoMpaDã. Conquest of Kalinjar in 1202 AD was Aibak’s crowning achievement. Nizami concludes: “The temples were converted into mosques… Fifty thousand men came under the collar of slavery and the plain became black as pitch with Hindus.””

Aligarh (Uttar Pradesh) . Hasan Nizami: Taju’l-Ma’sir, in Elliot and Dowson, Vol. II : Elliot and Dowson, History of India as told by its own Historians, 8 Volumes, Allahabad Reprint, 1964. pp. 224.

“In this improvisation,” rightly observes Habibullah, “was symbolised the whole Mamluk history”.
Lal, K. S. (1994). Muslim slave system in medieval India. New Delhi: Aditya Prakashan. Chapter 8 (quoting A.B.M. Habibullah, The Foundation of Muslim Rule in India)

Goel, Sita Ram (2001). The story of Islamic imperialism in India. ISBN 9788185990231

Delhi. Hasan Nizami: Taju’l-Ma’sir, in Elliot and Dowson, Vol. II : Elliot and Dowson, History of India as told by its own Historians, 8 Volumes, Allahabad Reprint, 1964. pp. 222-23
Variant: The conqueror entered the city of Delhi, which is the source of wealth and the foundation of blessedness. The city and its vicinity was freed from idols and idol-worship, and in the sanctuaries of the images of the Gods, mosques were raised by the worshippers of one Allah'...'Kutub-d-din built the Jami Masjid at Delhi, and 'adorned it with the stones and gold obtained from the temples which had been demolished by elephants,' and covered it with 'inscriptions in Toghra, containing the divine commands.

Quoted from Lal, K. S. (1999). Theory and practice of Muslim state in India. New Delhi: Aditya Prakashan. Chapter 5 (quoting Gordon Sanderson, 'Archaeology at the Qutb', Archaeological Survey of India Report, 1912-13; Ibn Battutah)

Dr. Murray Titus quoted from B.R. Ambedkar, Pakistan or The Partition of India (1946)

Thus enslavement resulted in conversion and conversion in accelerated growth of Muslim population.
Hasan Nizami, Taj-u-Maasir, E.D., II, 231. Farishtah, I, 62. quoted from Lal, K. S. (1994). Muslim slave system in medieval India. New Delhi: Aditya Prakashan. Chapter 5

`Abd al-Qadir Bada'uni, quoted from Goel, Sita Ram (2001). The story of Islamic imperialism in India. ISBN 9788185990231 Ch. 6
Muntakhab-ut-Tawarikh

Delhi. Hasan Nizami: Taju’l-Ma’sir, in Elliot and Dowson, History of India as told by its own Historians, Vol. II, p. 238-39.