Sun Chen
In 258, the Wu regent Sun Chen deposed the emperor Sun Liang and replaced him with Sun Xiu, the Prince of Langya (琅邪王). Before Sun Xiu arrived at the palace for the coronation, Sun Chen wanted enter the palace first and behaved in a manner as if he was going to usurp the throne. He then summoned the court officials for a meeting. All of them looked fearful except for Yu Si, who appeared calm and composed. Yu Si told Sun Chen: "My lord, you hold an important position in the state just like Yi Yin and the Duke of Zhou in the past. You also wield the authority to depose and enthrone emperors. You will be bringing peace to the spirits of the past rulers and bringing benefits to the people. Everyone is very excited about this. It is as if Yi Yin and Huo Guang have returned from the dead. However, now, you wish to enter the palace before the Prince's arrival. This will cause instability and make everyone feel suspicious of you. This isn't the way for you to establish a good reputation as a loyal and filial subject." Sun Chen felt unhappy after hearing Yu Si's words, but he nonetheless honoured Sun Xiu as the new emperor.