釋氏稽古略 2.312

2.312

His taboo name was You. He was the son of Crown Prince Yuande, Zhao, and the grandson of Emperor Yangdi. He was enfiefed as Prince of Dai. When Emperor Yangdi went on an imperial tour, he ordered the Prince of Dai to remain behind to guard Chang'an. At the time, he was thirteen years old. Li Yuan, Duke of Tang and Garrison Commander of Jinyang, raised troops. The Prince ordered various generals to resist him, but they were all defeated and fled. In the eleventh month, Yuan captured Chang'an. He escorted the Prince of Dai to ascend the imperial throne in the Tianxing Hall, changed the thirteenth year of Daye to the first year of Yining, and honored Emperor Yangdi from afar as Supreme Emperor. Yuan entered Chang'an from Changle. Yuan was granted the yellow battle-ax and credentials, becoming Grand Commander-in-Chief of All Military Affairs Inside and Outside the Capital, Director of the Department of State Affairs, and Grand Chancellor. Soon afterwards, he was enfiefed as Prince of Tang. Using the Wude Hall as the Chancellor's Office, he established official staff, appointing Pei Ji as Chief Administrator and Liu Wenjing as Marshal. Yuan's son Jiancheng became Heir Apparent of Tang; his second son Shimin became Intendant of the Capital and Duke of Qin; his third son Yuanji became Duke of Qi (Sui shu).