He Jin

He Jin (died 189) was the elder half-brother of Empress He, consort to Emperor Ling of the late Eastern Han Dynasty in China. He shared power with his sister as regents in 189, following the death of Emperor Ling. In the ensuing struggle with the influential eunuch faction for power, He Jin was assassinated. His death allowed Dong Zhuo to seize military control over the capital Luoyang and take control of the imperial court. The subsequent breakdown of central command brought forth the beginning of massive civil wars which led to the formation of the era known as the Three Kingdoms.

He Yan(何晏), who was executed in the Incident at Gaoping Tombs in AD 260 was a grandson of He Jin.