Lan Yu, the Duke of Liangguo, was Zhu Yuanzhang's right-hand man, and after the establishment of the Ming Dynasty, Zhu Yuanzhang's eldest son Zhu Biao was made crown prince, and Lan Yu was the younger brother of Zhu Biao's mother-in-law, so he became closer to the prince. During a northern expedition to the blue jade, he saw that Zhu Di, the king of Yan, was very powerful in his fiefdom, and his behavior was similar to that of the emperor.
After Lan Yu returned, he told the crown prince Zhu Biao: "I heard that the King of Yan has the qi of the Son of Heaven, and I also ask Your Highness to pay more attention to it, just in case of an accident." "Crown Prince Zhu Biao was loyal and was very kind to his younger brothers, and when his brothers made mistakes and were punished, he was the one who circumvented himself and interceded with the emperor to spare his brothers punishment. Zhu Biao said to Lan Yu, "King Yan is very respectful to me and would never do such a thing." Lan Yu didn't want to say anything more, and said to Zhu Biao, "I am favored by Your Highness, that's why I told you about these important matters involving stakes, and I hope that I will not be convinced by my words." ”
Soon, the crown prince Zhu Biao fell ill and died, and Zhu Yuanzhang felt that Zhu Di, the Prince of Yan, was a man of gloom and calm, very much like himself, and wanted to make him crown prince, but he was opposed by some ministers, who felt that this could not be explained to other princes, so Zhu Yuanzhang had to appoint Zhu Biao's son Zhu Yunjiao as the emperor's grandson. When the King of Yan saw that the crown prince was dead, and no one spoke for Lan Yu anymore, he said to Zhu Yuanzhang when he entered the dynasty: "In the imperial princes, some people indulge in lawlessness, and if they are not punished, they will become a trend that will not fall in the future." Everyone knows in their hearts that "from lawlessness" refers to sapphire. But in this case, Sapphire still does not have a sense of crisis, and does not restrain herself at all in life.
He went out to Xifan, captured the escape, and captured the rebel commander of Jianchangwei, he felt that the merit was greater, the more he felt that he was full of spirit, he thought that after returning to the dynasty, the emperor would definitely give a great reward, but he did not expect that Zhu Yuanzhang simply ignored him, and when he officially established the emperor's grandson, he thought that he would make himself the prince's master, but Zhu Yuanzhang let Feng Sheng and Fu Youde become the prince's master. Lan Yu was very angry, and rolled up his sleeves and shouted, "Don't I even have the qualifications to be a prince and a master?" Zhu Yuanzhang was even more unhappy about this trouble. Since then, none of the blue jade has been allowed to play in the court, but the blue jade not only does not know how to restrain, but also becomes more arrogant, even if it accompanies the emperor to dinner, it is not inferior. Once, when he saw Zhu Yuanzhang passing by by, he pointed and said, "That person who rides by public opinion already suspects me!" ”
As soon as these words are uttered, great calamity comes. In fact, Blue Jade did not have the heart of rebellion, but only "the curse came out of the mouth". When Jinyi heard this, he immediately told Zhu Yuanzhang, and said that he and Zhang Yi, Chen Heng, and others were preparing to rebel and wanted to hijack the car, Zhu Yuanzhang listened, and was trying to kill people but could not find an excuse, so he indiscriminately arrested these people together, interrogated them by the Punishment Department, turned them all into truth, and killed them all. It was not enough, and all those who occasionally communicated with Blue Jade were not spared, and they were framed on all sides, connected in all directions, and the old xun in the imperial court was almost swept away.