In 307, Sima Yue, who had emerged victorious in the aftermaths of the War of the Eight Princes as the regent for Emperor Huai, under the advice of his wife Princess Pei, commissioned Sima Rui as the military commander of parts of Yang Province (揚州, modern Zhejiang and southern Jiangsu and Anhui) south of the Yangtze River, with his post at Jianye.
Emperor | Holy Roman Emperor | Wilhelm II, German Emperor | Joseph II, Holy Roman Emperor | Maximilian I, Holy Roman Emperor | Roman Emperor | Frederick II, Holy Roman Emperor | Yuan Dynasty | Emperor of Japan | emperor | Roman emperor | Frederick I, Holy Roman Emperor | Charles VI, Holy Roman Emperor | Francis II, Holy Roman Emperor | Ferdinand I, Holy Roman Emperor | Charles IV, Holy Roman Emperor | William I, German Emperor | Hongwu Emperor | Sigismund, Holy Roman Emperor | Godspeed You! Black Emperor | Yellow Emperor | Otto I, Holy Roman Emperor | Henry II, Holy Roman Emperor | German Emperor | Frederick III, German Emperor | Emperor Meiji | Yuan | Frederick III, Holy Roman Emperor | Francis I, Holy Roman Emperor | Emperor Wu |
In spring 312, though, Shi Le, preparing to have his army cross the Yangtze River to attack Jianye, then under the control of the Jin general Sima Rui the Prince of Langye, encountered difficulties as his army was trapped in the rain.
After Sima Rui the Prince of Langye was posted to Jianye as the military commander of the area south of the Yangtze in 307, he invited Yu Liang to serve on his staff, and during that time, he became impressed by Yu's abilities and solemn attitude, and he took Yu Liang's sister Yu Wenjun to be his son Sima Shao's wife.