Hindu learning in general was suppressed since Hindu and Buddhist schools were attached to temples and monasteries. These were regularly destroyed fr… - Qutb-ud-din Aibak

The first of these bloody sultans, Kutb-d Din Aibak, was a normal specimen of his kind—fanatical, ferocious and merciless. His gifts, as the Mohammedan historian tells us, “were bestowed by hundreds of thousands, and his slaughters likewise were by hundreds of thousands.” In one victory of this warrior (who had been purchased as a slave), “fifty thousand men came under the collar of slavery, and the plain became black as pitch with Hindus.”

Women and children were the prize of the warriors, and as early as the days of Qutbuddin Aibak "even a poor Muslim householder (who was also a soldier) became owner of numerous slaves."

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 the images of the Gods, mosques were raised by the worshippers of one God.'...
'Kutbu-d din built the Jami' Masjid at Delhi, and adorned it with stones and gold obtained from the temples which had been demolished by elephants, and covered it with inscriptions in Toghra, containing the divine commands.