Sima Yu
Sima Yu originally had a wife from high birth—Princess Wang Jianji (王簡姬), who bore him his heir apparent Sima Daosheng (司馬道生) and Sima Yusheng (司馬俞生). However, Sima Daosheng was described as careless and frivolous. In 348, while Sima Yu was prime minister for his grandnephew Emperor Mu, Sima Daosheng was accused of unspecified crimes. He was deposed and died in imprisonment. Princess Wang died in distress. Sima Yusheng and three other sons of Sima Yu all died early, leaving him without an heir, and his concubines were not conceiving any more. He retained a magician to look at his concubines to see which one could conceive an heir, and the magician looked at all of them and opined that none was destined to give him an heir—but then he saw Li Lingrong, who was tall, dark-skinned and who was derogatorily referred to as an African people, and he, in surprised, yelled out, "She is the one!" Sima Yu therefore took her as a concubine, and she bore him two sons—Sima Yao in 362 and Sima Daozi in 363 or 364. Sima Yao was subsequently named heir apparent. She also bore Sima Yu a daughter, who would later be Princess Poyang.