The Masjid-i Jahan-Namaa, commonly known as the Jama Masjid of Delhi, is the principal mosque of Old Delhi in India and the largest mosque in Asia. Commissioned by the Mughal Emperor Shah Jahan, builder of the Taj Mahal, and completed in the year 1656 AD, it is one of the largest and best-known mosques in India. It lies at the origin of a very busy central street of Old Delhi, Chandni Chowk.
The later name, Jaama Masjid, is a reference to the weekly Friday noon congregation prayers of Muslims, which are usually done at a mosque, the "congregational mosque" or "jaama masjid". The courtyard of the mosque can hold up to twenty-five thousand worshipers. The mosque also houses several relics in a closet in the north gate, including a copy of the Qur'an written on deer skin.