Li Shiji
Also in 643, Emperor Taizong would see major turmoil among his own closest family. In spring 643, his son Li You () the Prince of Qi, angry over restrictions that his secretary general Quan Wanji () had often placed on him, killed Quan and declared a rebellion. Emperor Taizong sent Li Shiji against Li You, but before Li Shiji could engage Li You, Li You was captured by his own subordinate Du Xingmin () and delivered to Chang'an, where Emperor Taizong ordered him to commit suicide and executed 44 of his associates.