"Barring the pre-Sultanate monuments of Kutch District, this is the earliest extant mosque in India and consists of a rectangular court, enclosed by cloisters, erected with the carved columns and other architectural members of twenty-seven Hindu and Jain temples demolished by Qutbu'd Din Aibak, as recorded by him in his own inscription on the main eastern entrance. Qutbu'd-Din calls the mosque as Jami'-Masjid and states that on the original erection of each of the demolished temples a sum of twenty lacs of coins had been spent. Later it came to be called the Quwwatu'l Islam ('might of Islam') mosque. The western portion of its courtyard occupies the original site of one of the demolished temples."
January 1, 1970
https://en.wikiquote.org/wiki/Qutb_Minar_complex