公孫淵
The next year, however, Sun Quan would have yet another misadventure in his dealings with Gongsun Yuan, as Gongsun sent messengers to him, offering to be his subject. Sun Quan was ecstatic, and appointed Gongsun Yuan the Prince of Yan and granted him the nine bestowments, and further sent a detachment of 10,000 men by sea north to assist Gongsun Yuan in his campaign against Wei, against the advice of nearly every single one of his high-level officials, particularly Zhang Zhao. Once the army arrived, however, Gongsun Yuan betrayed them, killing Sun Quan's officials Zhang Mi () and Xu Yan (), whom Sun had sent to grant the bestowments and seized their troops. Once that happened, the enraged Sun Quan wanted to personally head north with a fleet to attack Gongsun Yuan, and initially, not even Lu Xun's opposition was able to stop him, although he eventually calmed down and did not follow through. To his credit, he also personally went to Zhang Zhao's house and apologised to him. Further, despite the deterioration in his previous clear thinking, he was still capable of making proper decisions at times. For example, in 235, when, as a sign of contempt, Wei's emperor Cao Rui offered horses to him in exchange for pearls, jade, and tortoise shells, Sun Quan ignored the implicit insult and made the exchange, reasoning that his empire needed horses much more than pearls, jade or tortoise shells.