The Red Fort or Lal Qila () is a historic fort in Old Delhi, Delhi in India that served as the main residence of the Mughal Emperors. Emperor Shah Jahan commissioned construction of the Red Fort on 12 May 1638, when he decided to shift his capital from Agra to Delhi. Originally red and white, its design is credited to architect Ustad Ahmad Lahori, who also constructed the Taj Mahal. The fort represents the peak in Mughal architecture under Shah Jahan and combines Persianate palace architecture with Indian traditions. The fort was plundered of its artwork and jewels during Nader Shah's invasion of the Mughal Empire in 1739. Most of the fort's marble structures were subsequently demolished by the British following the Indian Rebellion of 1857. The fort's defensive walls were largely undamaged, and the fortress was subsequently used as a garrison. On 15 August 1947, the first prime minister of India, Jawaharlal Nehru, raised the Indian flag above the Lahori Gate. Every year on India's Independence Day (15 August), the prime minister hoists the Indian tricolour flag at the fort's main gate and delivers a nationally broadcast speech from its ramparts. The Red Fort was designated a UNESCO World Heritage Site in 2007 as part of the Red Fort Complex. Etymology The name Red Fort is a translation of the Hindustani (, ), deriving from its red sandstone walls. Lal was derived from Hindustani language meaning "Red" and Qalàh derived from Arabic word meaning "Fortress". As the residence of the imperial family, the fort was originally known as the "Blessed Fort" (). Agra Fort is also known as . History Emperor Shah Jahan commissioned construction of the Red Fort on 12 May 1638, when he decided to shift his capital from Agra to Delhi. Originally red and white, Shah Jahan's favourite colours, its design is credited to architect Ustad Ahmad Lahori, who also 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 Islamic month of Muharram, on 13 May 1638. Supervised by Shah Jahan, it was completed on 6 April 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 city of Shahjahanabad, which is present-day Old Delhi. Shah Jahan's successor, Aurangzeb, added the Moti Masjid (Pearl