Sima Yu
Sima Yue was born in 322 as the second son of Emperor Ming, by his wife Empress Yu Wenjun. After his father died in 325 and was succeeded by his brother Emperor Cheng, Sima Yue was created the Prince of Wu in 326. In 327, because his uncle Sima Yu the Prince of Langya wanted to yield that more honorific title, Sima Yu was created the Prince of Kuaiji and Sima Yue was created the Prince of Langya. It is not known where Sima Yue was during the Su Jun Disturbance of 326–328—whether he was captured and held hostage like his emperor brother, at his principality of Wu (which Su Jun did not occupy), or elsewhere. During his brother's reign, he received a progression of offices, but did not appear to actually participate in major decision-making.