Emperor Gaozu of Tang - Rebellion Against Emperor Yang of Sui

Rebellion Against Emperor Yang of Sui

Emperor Yang, with Li Yuan and Wang Rengong (王仁恭), the governor of Mayi Commandery (馬邑, roughly modern Shuozhou, Shanxi), over their inability to stop Eastern Tujue incursions and the growing strengths of agrarian rebels, particularly the Eastern Tujue-support Liu Wuzhou the Dingyang Khan, who soon rose against Wang and killed him and soon captured Emperor Yang's secondary palace near Taiyuan. Li Yuan also became fearful that there had been prophecies throughout the empire that the next emperor would be named Li—and that Emperor Yang had killed another official, Li Hun (李渾) and Li Hun's clan over his fears that Li Hun's nephew Li Min (李敏, the son-in-law of Emperor Yang's sister Yang Lihua the Princess Leping) had imperial ambitions.

Meanwhile, Li Yuan's second son, by his wife Duchess Dou (who had died earlier), Li Shimin, was with him in Taiyuan, and was secretly planning rebellion against Sui rule with Pei Ji the head of the household at Emperor Yang's secondary palace nearby and Liu Wenjing the Jinyang County (晉陽, i.e., Taiyuan) magistrate, but at first did not reveal their plans to Li Yuan. At Li Shimin's urging, Pei Ji, who had also earlier, against regulations, allowed Li Yuan to have sexual relations with some of late Emperor Wen's imperial concubines, persuaded Li Yuan that it was necessary for him to rebel. Li Yuan began to gather forces from the region, claiming that they were necessary to defend against Eastern Tujue, which drew suspicions from his deputies Wang Wei (王威) and Gao Junya (高君雅). Li Yuan, also fearful that Wang and Gao would act against him first, then used an Eastern Tujue attack as an excuse to falsely claim that Wang and Gao were working in concert with Eastern Tujue's Shibi Khan Ashina Duojishi, executing them, while preparing for formal declaration of rebellion. He sent secret messengers to Hedong (河東, in modern Yuncheng, Shanxi) to recall his sons (as he had left his sons Li Jiancheng, Li Yuanji, both by Duchess Dou as well, and Li Zhiyun (李智雲), by his concubine Lady Wan, there to watch over his household) and the capital Chang'an to recall his daughter (the later Princess Pingyang) and her husband Chai Shao (柴紹). Li Jiancheng and Li Yuanji, leaving Li Zhiyun at Hedong, soon met with Chai, and they togethered arrived at Taiyuan. (Li Yuan's daughter, believing it would be difficult for her to flee with Chai, chose to hide instead.)

Once Li Jiancheng, Li Yuanji, and Chai arrived at Taiyuan, Li Yuan formally declared his rebellion—but cast it as a declaration of his wishes to declare Emperor Yang's grandson Yang You the Prince of Dai, who was then at Chang'an, emperor, and honor Emperor Yang as Taishang Huang (retired emperor). He contacted Ashina Doujishi, offering tributes, and received logistical support from Eastern Tujue. He put Li Jiancheng and Li Shimin in charge of his army and, leaving Li Yuanji in charge at Taiyuan, advanced south. (Meanwhile, the Sui officials at Hedong arrested Li Zhiyun and delivered him to Chang'an, where he was executed.)

His daughter Pingyang sold her possessions to raise an army for him. She persuaded several other leaders to fight under her banner. They took several towns and her army swelled until she had 70.000 troups under her command.

Meanwhile, Li Yuan wrote another rebel leader, Li Mi the Duke of Wei, who was near Luoyang, trying to see if Li Mi would be willing to follow him, but Li Mi, believing in his own strength, had his secretary Zu Junyan (祖君彥) write Li Yuan for him in this way:

Although I and you, my older brother, are of different branches, but we are both Lis. I know that I do not have sufficient strength, but by the love of the men on this earth, I have been made the leader. I hope that you will support and help me. Let us capture Ziying at Xianyang, and let us kill Xin of Shang at Muye; would it not be a great accomplishment?

Li Yuan was dismayed but, not wanting to make another enemy, wrote back humbly:

Although I am ordinary and foolish, but I have had the opportunity to, by my ancestors' largess, receive the opportunity to be an imperial messenger when leaving the capital and a guard leader in the capital. If the administration falls and I am unable to help it, even the most understanding wise man will rebuke me. Therefore, I have organized a righteous army and sought peace with the barbarians to the north to try to calm the earth and to protect Sui. However, for the people under the heavens, there must be someone to rule over them, and other than you, who can be that person? I am too old – over 50 – and that is not my intent, but I am happy to support you, my younger brother. I hope to be able to climb onto the scale of a dragon and hold onto the wing of a phoenix, and I hope that you, my younger brother, will soon, in accordance with the prophecy, pacify all who are on this earth. You are the leader among the Li, and I hope that you will be gracious and accept me, and to give me again the domain of Tang; that will be enough glory for me. I do not have the heart to hear such commands as killing Xin of Shang at Muye, nor do I dare to listen to the order of capturing Ziying at Xianyang. Also, the Fen and Jin region requires pacification right now, and I am not yet able to arrange a time for the meeting at Mengjin .

Li Mi was pleased with Li Yuan's response, believing that Li Yuan was willing to support him, and from that point on, Li Mi and Li Yuan often exchanged messengers. Li Yuan's campaign against Chang'an thus went without opposition from Li Mi. Meanwhile, however, when Li Yuan arrived near Hedong, his army was bogged down by the weather, and with food running out, there were rumors that Eastern Tujue and Liu Wuzhou would attack Taiyuan. Li Yuan initially ordered retreat, but at the earnest opposition by Li Jiancheng and Li Shimin, continued to advance. After defeating Sui forces at Huoyi (霍邑, also in modern Yuncheng), he decided to leave a small contingent to watch over Hedong while advancing across the Yellow River into Guanzhong (i.e., the Chang'an region). Once he did, he headed for Chang'an himself, while sending Li Jiancheng to capture the territory around the Tong Pass region to prevent Sui forces at Luoyang from reinforcing Chang'an and Li Shimin north of the Wei River to capture territory there. Meanwhile, his daughter had also risen in rebellion in support of him, and she was able to gather a sizable army and capture some cities. She joined forces with Li Shimin and her husband Chai Shao. Soon, Li Yuan reconsolidated his forces and put Chang'an under siege. In winter 617, he captured Chang'an and declared Yang You emperor (as Emperor Gong). He had himself made regent (with the title of grand chancellor) and created the Prince of Tang. (Meanwhile, most of Sui territory did not recognize Emperor Gong as emperor and continued to recognize Emperor Yang as emperor and not as retired emperor.) He sent his nephew Li Xiaogong south, and Li Xiaogong was able to persuade the Sui cities in modern southern Shaanxi, Sichuan, and Chongqing to submit.