remind and motivate his subordinates. He called for a meeting and asked them to discuss the advantages and disadvantages of playing weiqi. One of them, Wei Yao (), went home, wrote an essay on this topic and presented it to Sun He, who had copies of it distributed among his personal staff. Succession struggle against Sun Ba and deposal Sun He's mother, Lady Wang, was not on good terms with Sun Quan's eldest daughter, Sun Luban. As a result, Sun Luban disliked her half-brother, Sun He. On one occasion, Sun Quan could not attend a ceremony at the imperial ancestral temple because he was sick, so he ordered Sun He to take his place. Zhang Xiu, an uncle of Sun He's wife Crown Princess Zhang (), lived near the imperial ancestral temple so he invited Sun He to stay at his residence during that period. Sun Luban sent her servants to spy on Sun He and reported to her father that Sun He was not in the imperial ancestral temple and was instead staying with his in-laws and plotting something. She also used the opportunity to slander Sun He's mother, Lady Wang, whom she had a feud with, by telling Sun Quan that Lady Wang expressed glee when she heard that Sun Quan was sick. Sun Quan believed his daughter and became furious with Lady Wang. Lady Wang later died in distress. Sun He also fell out of his father's favour as a result and he became worried that his father would remove him from his position as Crown Prince. Sometime in the 240s, Sun He became embroiled in a power struggle against his fourth brother, Sun Ba, the Prince of Lu, who wanted to seize the position of Crown Prince from him. In fact, it was Sun Quan himself who sowed the seeds of the conflict between his third and fourth sons. Although Sun Quan had already made Sun He the Crown Prince in 242, he also treated Sun Ba exceptionally well. After discussing among themselves, some officials strongly urged Sun Quan to ensure that Confucian rules of propriety were followed and upheld. For example, Sun He should be accorded greater honours and privileges as compared to Sun Ba because he, as the Crown Prince, was in a higher position compared to the other princes. However, Sun Quan failed to make a clear distinction between his sons, so the