Shah Jahan's first contribution to the fort commenced in the year of his coronation, 1628, and continued until 1645. Shah Jahan first ordered the construction of the Diwan-i-Aam in the style of a Chehel Sotoun - a Persian style 40-pillar public audience hall. Though construction of the Shah Burj commenced under Jahangir, Shah Jahan was displeased with its design and appointed Asif Khan to oversee reconstruction. Shah Jahan's Shah Burj forms a quadrangle with the famous Sheesh Mahal, and Naulakha Pavilion. Both are attributed to Shah Jahan, although the Naulakha Pavilion may be a later addition possibly from the Sikh era. The white marble Moti Masjid, or Pearl Mosque, also dates from the Shah Jahan period.
