Red Fort, Mughal fort in Old Delhi, India. It was built by Shah Jahān in the mid-17th century and remains a major tourist attraction. The fort was designated a UNESCO World Heritage site in 2007. The fort’s massive red sandstone walls, which stand 75 feet (23 metres) high, enclose a complex of palaces and entertainment halls, projecting balconies, baths and indoor canals, and geometrical gardens, as well as an ornate mosque. Among the most famous structures of the complex are the Hall of Public Audience (Diwan-i-ʿAm), which has 60 red sandstone pillars supporting a flat roof, and the Hall of Private Audience (Diwan-i-Khas), which is smaller and has a pavilion of white marble. An earlier red fort had been built in Old Delhi in the 11th century by the Tomara king Anangapala. The Quṭb Mosque now stands on the site. Delhi sultanate, principal Muslim sultanate in north India from the 13th to the 16th century. Its creation owed much to the campaigns of Muʿizz al-Dīn Muḥammad ibn Sām (Muḥammad of Ghūr; brother of Sultan Ghiyāth al-Dīn of Ghūr) and his lieutenant Quṭb al-Dīn Aibak between 1175 and 1206 and particularly to victories at the battles of Taraōrī in 1192 and Chandawar in 1194.

The Ghūrid soldiers of fortune in India did not sever their political connection with Ghūr (now Ghowr, in present Afghanistan) until Sultan Iltutmish (reigned 1211–36) had made his permanent capital at Delhi, had repulsed rival attempts to take over the Ghūrid conquests in India, and had withdrawn his forces from contact with the Mongol armies, which by the 1220s had conquered Afghanistan. Iltutmish also gained firm control of the main urban strategic centres of the North Indian Plain, from which he could keep in check the refractory Rajput chiefs. After Iltutmish’s death, a decade of factional struggle was followed by nearly 40 years of stability under Ghiyāth al-Dīn Balban, sultan in 1266–87. During this period Delhi remained on the defensive against the Mongols and undertook only precautionary measures against the Rajputs. Under the sultans of the Khaljī dynasty (1290–1320), the Delhi sultanate became an imperial power. ʿAlāʾ al-Dīn (reigned 1296–1316) conquered Gujarat (c. 1297) and the principal fortified places in Rajasthan (1301–12) and reduced to vassalage the principal Hindu kingdoms of southern India (1307–12). His forces also defeated serious Mongol onslaughts by the Chagatais of Transoxania (1297–1306).