The Forbidden City, built between 1406 and 1420, served for 500 years (until the end of the imperial era in 1911) as the seat of all power in China, the throne of the Son of Heaven and the private residence of all the Ming and Qing dynasty emperors. The complex consists of 980 buildings with 8,707 bays of rooms and covers 720,000 m2 (7,800,000 sq ft). Jingshan (Prospect Hill) is an artificial hill immediately north of the Forbidden City. It was constructed in the Yongle era of the Ming Dynasty entirely from the soil excavated in forming the moats of the Imperial Palace and nearby canals. The last emperor of the Ming Dynasty, Chongzhen, committed suicide by hanging himself here in 1644.