The Masjid-i Jahan-Numa, the 'World-reflecting Mosque', commonly known as the Jama Masjid of Delhi, is the principal mosque of Old Delhi in India. Commissioned by the Mughal Emperor Shah Jahan, it is the second largest and best-known mosque in India. The construction began in 1650 and was completed in 1656. It lies at the beginning of the Chawri Bazar Road, a very busy central street of Old Delhi. The later name, Jama Masjid, refers to the weekly Friday noon congregation prayers of Muslims, Jummah, which are usually done in a mosque, the "congregational mosque" or "jama masjid".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 deerskin.