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His surviving descendants though got back on the Sima's good side. Wasn't his sister married to one of the Sima? (Zhou, younger brother of Zhao, grandfather if the founder of Eastern Jin, IIRC)
I just saw the accounts of this in the
Shishuo Xinyu and
Jin Shu. Zhuge Dan's daughter was already married to Sima Zhou before his rebellion. Zhuge Dan was thus also a father-in-law to one of Sima Zhao's brothers. Sima Zhou was the grandfather of Sima Rui, the first Eastern Jin emperor.
After the defeat and death of Zhuge Dan in 258, his youngest son Zhuge Jing fled south to Wu and became a general there. Following the conquest of Wu by Western Jin in 280, he returned to the Zhuge family home in Langya. Zhuge Jing had been friends with Sima Yan in their boyhood, but now because Sima Yan's father (Sima Zhao) was the killer of Zhuge Jing's father, Zhuge Jing refused all contact with him, and always sat with his back facing the direction of the Luo River to show his non-submission to the imperial court in Luoyang.
Of course, Sima Yan was now emperor and tried to arrange a meeting through Zhuge Jing's older sister (i.e. Sima Zhou's wife and thus Sima Yan's aunt). Once when Zhuge Jing was visiting his sister, Sima Yan went over too. Zhuge Jing then hid from Sima Yan in the toilet. Eventually he had no choice but to come out. Sima Zhao said to him, "I never expected we would meet again today!"
Zhuge Jing replied, "It's only because I am unable to 'swallow charcoal and lacquer his body' that today I look upon your sage face." And with that the tears coursed down in a flood. The emperor was filled with shame and left the room. Zhuge Jing never held an official position under the Western Jin until the day he died.
[Zhuge Jing was alluding to the story of Yu Rang, the famous Warring States assassin who went to great lengths to avenge the defeat and killing of his lord Xun Yao (the Earl of Zhi) by Xun's rival Zhao Xiangzi. He fled into the hills, changed his name, and after one failed assassination attempt decided to disguise himself more drastically. He lacquered his body to cause his skin to break out in ulcers, swallowed charcoal to disguise his voice, and then lay in wait for Zhao Xiangzi under a bridge. But he was recognized and caught, and committed suicide.]
Zhuge Jing's son Zhuge Hui fled south after the fall of the Western Jin, and rose to high positions in the Eastern Jin court. He died in 345. His elder brother Zhuge Yi also served the Eastern Jin with distinction and rose to the post of Minister of Rites. Zhuge Jing's son Zhuge Gan rose to the position of Senior Consultant.