Sūn Jùn, appellation Zǐyuàn, was Sūn Jiān’s younger brother Jìng’s great-grandson. Jìng begat Gǎo, Gǎo begat Gōng, who became Cavalier Attendant-Cadet. Gōng begat Jùn.
When young he was skilled with bow and horse, and had courage and decisiveness. At the end of Sūn Quán’s reign, he was Commandant of the Martial Guard and Palace Attendant. When Quán was about to die, he received final orders to support the government, with command as General of the Martial Guard, thus commanding the night guard, and was given fief as Marquis of Dūxiāng.
When he executed Zhūgě Kè , he was promoted to Chancellor and General-in-Chief, with command over all internal and external military affairs, with a Staff of Authority, and advanced in fief to Marquis of Fùchūn. Téng Yìn because he was [Zhūgě] Kè’s son Sǒng’s wife’s father resigned his position. Jùn said: “Gǔn and Yǔ did not share guilt [by their family relation], so why should you Lord Téng?” Though Jùn and Yìn were not internally in agreement, yet outside they showed tolerance to one another, and Yìn’s fief was advanced to Marquis of Gāomì, and they worked together as before. (1)
- (1) Wúlù states: The various ministers sent up memorials, together nominating Jùn as Grand Commandant, and recommending Yìn as Excellency over the Masses. At the time there was one who flattered Jùn, who believed all authority should be with the ruling family. If Téng Yìn were made an inferior lord, the many hearts attached to him could not betray them. Therefore it was memorialized that Jùn be appointed Chancellor, and also not install a Censorate Secretary, and the scholars all lost hope.
Jùn did not have great reputation, was arrogant and dangerous and harmful, and frequently executed and killed, and so the common people were disturbed. He also defiled the palace [wo]men, and with the princess [Sūn] Lǔbān had an illicit affair. Wǔfèng first year , Marquis of Wú [Sūn] Yīng plotted to kill Jùn, but Yīng’s plan leaked and he died.
Second year , Wèi Generals Guànqiū Jiǎn and Wén Qīn led their armies in rebellion, and with the Wèi people battled at Lèjiā. Jùn sent General of Elite Cavalry Lǚ Jù and General of the Left Liú Zàn to attack Shòuchūn, met with the defeated Qīn and received his surrender, and the army returned. (1)
- (1) Wúshū states: Liú Zàn appellation Zhèngmíng, was a Kuàijī Chángshān man. When he young he was appointed a commandery official, and with the Yellow Scarves rebel commander Wú Huán fought, and with his own hand beheaded Huán. Zàn in one leg had been injured, and thereafter it was crooked and could not extend. But by nature he was fierce, liked reading military texts and the three histories. Every time he read of the battle achievements of ancient generals, he would then facing the text sigh, and say to his attendants and relatives: “Now the world Under Heaven is in chaos, and heroes all rise up, like in previous ages. Riches and honor are not long held by the same people, yet I as a cripple am among the gates and alleys, and there is no difference if I live or die. Now I wish to cut my leg. If by fortune I do not die and my leg can extend then I can again be of use, and if not just let me die.” His relatives all did not permit this. After a while, Zàn thereupon with a knife cut his own tendons, the blood gushed out, and he was unconscious for a long time. The household was all afraid, but as it was already like this they extended his leg. The leg was extended and the wound healed, and afterward he could slightly walk. Líng Tǒng heard of this, invited him to meet, was greatly impressed with him, and so memorialized and recommended Zàn, and so he was employed. He accumulated military achievements, and slowly reached Colonel of Garrisoned Cavalry. At the time there there were both gains and losses, and he frequently gave warnings, always speaking bluntly and not flattering, and [Sūn] Quán because of this disliked him. When Zhūgě Kè invaded Dōngxīng  Zàn was in the front division, and in battle fought on the front lines, greatly defeating the Wèi military, and was promoted to General of the Left. When Sūn Jùn invaded Huáinán , Zàn received a Staff of Authority, was appointed Left Protector of the Army. Before he arrived at Shòuchūn, alone the road he fell ill, and Jùn ordered Zàn to lead the heavy carriages and first return. Wèi officer Jiǎng Bān with 4000 infantry and cavalry pursued Zàn. Zàn’s illness was severe, he could not organize his lines, and knew he would certainly be defeated, so he gave his seals and ribbons to his younger brother’s son to send him back, saying: “I from when I became an officer, destroying enemies and seizing their flags, have never been defeated. Now my illness is severe and my troops entangled, and the army is weak and no match. You must quickly go. Dying with me is no good for the state, and would only please the enemy and that is all.” His younger brother’s son would not accept, so he drew his sword to strike him, and so he left. Before this, when Zàn became an officer, when he faced the enemy he would always first let down his hair and shout to the sky to defy the sounds and sing, and his attendants joined him, and when finished they advanced to battle, and in battle there were none he did not overcome. When he was defeated, he sighed and said: “I in battle have my constant methods, but now with my illness like this, this is my fate!” Therefore he was killed. At the time he was seventy-three years, and the army all lamented him. His two sons Lüè and Píng both became leading Generals.
That year, a Shǔ envoy arrived, and General Sūn Yí, Zhāng Yí, Lín Xún, and others wished to during the meeting kill Jùn. The plan leaked, and Yí and others killed themselves. The dead numbered several tens, including the princess [Sūn] Lǔyù.
Jùn wished to build fortifications at Guǎnglíng. The Court officials knew it could not be fortified, but were afraid and so none dared speak out. Only Téng Yìn remonstrated and protested, but was not followed, and the achievement indeed was not completed.
That next year, Wén Qīn persuaded Jùn to invade Wèi, and Jùn sent Qīn with Lǚ Jù, [General of] Chariots and Cavalry Liú Zuǎn, [General] Defending the South Zhū Yì, and General of the Front Táng Zī to from Jiāngdū enter the Huái and Sì [rivers], with plans to take Qīng and Xú [provinces]. Jùn and [Téng] Yìn arrived at Shítóu, and because of the departure banquet for them, led attendants, a hundred people, to enter [Lǚ] Jù’s camp. Jù’s army was orderly and organized, and Jùn hated this, claimed heart pains and left. Then he dreamed of being attacked by Zhūgě Kè, was afraid and fell ill and died. At the time he was aged thirty-eight years, and afterward he entrusted affairs to [Sūn] Chēn.