Sima Lun restored the late Crown Prince Yu's reputation and had his son, Sima Zang (司馬臧), created crown prince. However, Sima Lun himself had designs on the throne, and he and Sun Xiu became partial to placing those who favored them in power. Emperor Hui's brother, Sima Yun (司馬允) the Prince of Huai'nan, correctly determined what Sima Lun's ambitions were, and as a result, Sima Lun and Sun tried to strip Sima Yun's military command. When Sima Yun read the edict ordering him to turn over the troops, he saw that it was Sun Xiu's handwriting—and became enraged and started a rebellion with his troops. Initially, he had successes against Sima Lun's troops and was almost able to capture Sima Lun's mansion, during the course of one day. Late in the day, Chen Zhun (陳準), who secretly supported Sima Yun, persuaded Emperor Hui to give him a banner that showed imperial support and was able to deliver it to Sima Yun, but his messenger, a friend of Sima Lun's son Sima Qian (司馬虔), instead tricked Sima Yun into receiving the banner and, as he did, cut off his head. His troops disbanded after his death.