Hasan Nizami on Qutb al-Din Aibak

“Kutbn-d din built the Jami Masjid at De1hi, 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.””

“In 1195 when Raja Bhim was attacked by Aibak 20,000 slaves were captured, and 50,000 at Kalinjar in 1202. “The temples were converted into mosques,” writes Hasan Nizami, “and the voices of the summoners to prayer ascended to the highest heavens, and the very name of idolatry was annihilated.”... Farishtah specifically mentions that during the capture of Kalinjar “fifty thousand kaniz va ghulam, having suffered slavery, were rewarded with the honour of Islam.” Thus enslavement resulted in conversion and conversion in accelerated growth of Muslim population.”