Emperor Shah Jahan commissioned construction of the Red Fort in 1638, when he decided to shift his capital from Agra to Delhi. Its design is credited to architect Ustad Ahmad Lahauri, the same architect who constructed the Taj Mahal. The fort lies along the Yamuna River, which fed the moats surrounding most of the walls. Construction began in the sacred month of Muharram, on 13 May 1638. Supervised by Shah Jahan, it was completed in 1648. Unlike other Mughal forts, the Red Fort's boundary walls are asymmetrical to contain the older Salimgarh Fort. The fortress-palace was a focal point of the medieval city of Shahjahanabad, which is present-day Old Delhi. Its planning and aesthetics represent the zenith of Mughal creativity prevailing during Shah Jahan's reign. His successor Aurangzeb added the Pearl Mosque to the emperor's private quarters, constructing barbicans in front of the two main gates to make the entrance to the palace more circuitous.

 

The administrative and fiscal structure of the Mughals declined after Aurangzeb, and the 18th century saw a degeneration of the palace. When Jahandar Shah took over the Red Fort in 1712, it had been without an emperor for 30 years. Within a year of beginning his rule, Shah was murdered and replaced by Farrukhsiyar. To raise money, the silver ceiling of the Rang Mahal was replaced by copper during this period. Muhammad Shah, known as 'Rangila' (the Colourful) for his interest in art, took over the Red Fort in 1719. In 1739, Persian emperor Nadir Shah easily defeated the Mughal army, plundering the Red Fort including the Peacock Throne. Nadir Shah returned to Persia after three months, leaving a destroyed city and a weakened Mughal empire to Muhammad Shah. The internal weakness of the Mughal empire made the Mughals titular heads of Delhi, and a 1752 treaty made the Marathas protectors of the throne at Delhi. The 1758 Maratha conquest of Lahore and Peshawar placed them in conflict with Ahmad Shah Durrani. In 1760, the Marathas removed and melted the silver ceiling of the Diwan-i-Khas to raise funds for the defence of Delhi from the armies of Ahmed Shah Durrani. In 1761, after the Marathas lost the third battle of Panipat, Delhi was raided by Ahmed Shah Durrani. Ten years later, Shah Alam ascended the throne in Delhi with Maratha support.In 1783 the Sikh Misl Karorisinghia, led by Baghel Singh Dhaliwal, conquered Delhi and the Red Fort. The Sikhs agreed to restore Shah Alam as emperor and retreat from the fort if the Mughals would build and protect seven Gurudwaras in Delhi for the Sikh gurus.

 

During the Second Anglo-Maratha War in 1803, forces of British East India Company defeated Maratha forces in the Battle of Delhi; this ended Maratha rule of the city and their control of the Red Fort. After the battle, the British took over the administration of Mughal territories and installed a Resident at the Red Fort.[10]:11 The last Mughal emperor to occupy the fort, Bahadur Shah II, became a symbol of the 1857 rebellion against the British in which the residents of Shahjahanbad participated.

 

Despite its position as the seat of Mughal power and its defensive capabilities, the Red Fort was not defended during the 1857 uprising against the British. After the rebellion failed, Bahadur Shah II left the fort on 17 September and was apprehended by British forces. He returned to Red Fort as a prisoner of the British, was tried in 1858 and exiled to Rangoon on 7 October of that year. With the end of Mughal reign, the British sanctioned the systematic plunder of valuables from the fort's palaces. All furniture was removed or destroyed; the harem apartments, servants' quarters and gardens were destroyed, and a line of stone barracks built.[23] Only the marble buildings on the east side at the imperial enclosure escaped complete destruction, but were looted and damaged. While the defensive walls and towers were relatively unharmed, more than two-thirds of the inner structures were destroyed by the British; steps were later taken by Lord Curzon to repair some damage.

 

Most of the jewels and artworks of the Red Fort were looted and stolen during Nadir Shah's invasion of 1747 and again after the failed Indian Rebellion of 1857 against the British colonialists. They were eventually sold to private collectors or the British Museum, British Library and the Victoria and Albert Museum. For example, the Koh-i-Noor diamond, the jade wine cup of Shah Jahan and the crown of Bahadur Shah II are all currently located in London. Various requests for restitution have so far been rejected by the British government.

 

1911 saw the visit of the British king and queen for the Delhi Durbar. In preparation of the visit, some buildings were restored. The Red Fort Archaeological Museum was also moved from the drum house to the Mumtaz Mahal.

 

The INA trials, also known as the Red Fort Trials, refer to the courts-martial of a number of officers of the Indian National Army. The first was held between November and December 1945 at the Red Fort.

 

On 15 August 1947, the first Prime Minister of India Jawaharlal Nehru raised the Indian national flag above the Lahore Gate. On each subsequent Independence Day, the prime minister has raised the flag and given a speech that is broadcast nationally.

 

After Indian Independence the site experienced few changes, and the Red Fort continued to be used as a military cantonment. A significant part of the fort remained under Indian Army control until 22 December 2003, when it was given to the Archaeological Survey of India for restoration. In 2009 the Comprehensive Conservation and Management Plan (CCMP), prepared by the Archaeological Survey of India under Supreme Court directions to revitalise the fort, was announced.