The Red Fort was the palace for Mughal Emperor Shah Jahan's new capital, Shahjahanabad, the seventh Muslim city in the Delhi site. He moved his capital from Agra in a move designed to bring prestige to his reign, and to provide ample opportunity to apply his ambitious building schemes and interests. The Red Fort stands at the eastern edge of Shahjahanabad, and gets its name from the massive wall of red sandstone that defines its four sides. The wall is 1.5 miles (2.5 km) long, and varies in height from 60ft (16m) on the river side to 110 ft (33 m) towards the city. Measurements have shown that the plan was generated using a square grid of 82 m.