Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Sima Yang (司馬羕) (284 - 29 March 329), courtesy nameYannian (延年) was an imperial prince of the Jin dynasty. A son of Sima Liang, Prince Wencheng of Runan, and grandson of Sima Yi, Yang was best known for supporting Su Jun during the latter's rebellion. After the rebellion's failure, he was executed.
Background and life under Emperor Hui
Sima Yang was born to Sima Liang late in Liang's life. During Yang's childhood, his father was embroiled in court politics as Yang's cousin Emperor Wu's successor Emperor Hui was developmentally disabled. In May 291, after the ouster and killing of Emperor Hui's first regent Yang Jun in April, Sima Liang was made co-regent with Wei Guan. Just a few months later in Julyu, Sima Liang and Wei Guan were killed by Sima Wei, who in turn was killed after Emperor Hui's empress Jia Nanfeng plotted against him.
References
Sima Yang's biography in Book of Jin recorded that he was eight (by East Asian reckoning) when his father was killed in Jul 291.
Zizhi Tongjian, vol. 94.
(羕字延年。) Jin Shu, vol.59
Sima Liang was born before 227, which meant that he was at least 58 years old when Yang was born.