The Masjid-i Jahan-Numa commonly known as the Jama Masjid of Delhi, is the principal mosque of Old Delhi.
Commissioned by the Mughal Emperor Shah Jahan, builder of the Taj Mahal, and completed in the year 1656 AD, it is the largest and best-known mosque in India. Shahjahan himself laid its foundation stone on the strong basements of a hillock on Friday the 6th of October 1650 AD corresponding to 10th of Shawwal 1060 AH.
The courtyard of the mosque can hold up to twenty-five thousand worshippers. The mosque also houses several relics in a closet in the north gate, including an antique copy of the Qur'an written on deer skin.
Wikipedia Entry : http://en.wikipedia.org/wiki/Jama_Masjid,_Delhi
Web : http://www.jmuf.org/index.htm