The excavation of Dingling began in 1956, after a group of prominent scholars led by Guo Moruo and Wu Han began advocating the excavation of Changling, the tomb of the Yongle Emperor, the largest and oldest of the Ming tombs near Beijing. Despite winning approval from premier Zhou Enlai, this plan was vetoed by archaeologists because of the importance and public profile of Changling. Instead, Dingling, the third largest of the Ming Tombs, was selected as a trial site in preparation for the excavation of Changling. Excavation completed in 1957 and a museum was established in 1959.