Zhang Chunhua
Wife of Sima Yi and mother of Sima Shi and Sima Zhao.
Zhang Chunhua was recorded of having murdered a maid out of fear of her leaking Sima Yi's feigning of illness to avoid serving Cao Cao. Afterwards, she would serve her family meals herself. She was later said to have staged a hunger strike after Sima Yi threw a tantrum at her. Her sons would join her in the strike, forcing Sima Yi to grudgingly apologize.
Zhang Chunhua was posthumously promoted to empress by her grandson Sima Yan after he unified the Three Kingdoms.