Background
Sun Liang's deposition was not an isolated event but one of the final chapters in the political aftermath left by the "Ergongzhizheng" — the Two-Palace Succession Dispute — of Sun Quan's later years. Sun Quan had designated his youngest son Sun Liang as heir precisely to sidestep the vortex of factional strife, but this also meant that the new emperor came to the throne without the network of allies he would have formed had he reached adulthood first, leaving him dependent on the dual support of the imperial clan and the consort clan. The consort clan on which Sun Liang relied was the Quan family — Empress Quan came from a prominent Wu-region family, and her father Quan Shang rose step by step to Generalissimo of the Guards, Marquis of Yongping, and Director of the Secretariat [c:16691]. Politically, this family had effectively served as the emperor's sole external support throughout the Chiwu and Taiping eras.
Key Figures
Quan Shang is the character who appears least conspicuous in this episode yet proves most decisive: he owed his rise to his daughter's entry into the palace, held command of the gate guards and the palace garrison, and by institutional logic should have served as the emperor's last line of defence when a strongman moved against the throne [c:16691]. Yet the combined narrative of his biography in San Guozhi and Wu Lu shows he possessed neither the talent of a great general nor political judgement — the Romance adds a further note to this portrait by showing him immediately leaking the news of his son-in-law's secret edict to his wife (Sun Chen's elder sister), which aligns precisely with the "mediocre consort-clan figure" image in the historical record. The collective defection to Wei of Quan Yi, Quan Duan, Quan Yi (of a different character), and Quan Yi (yet another) during Zhuge Dan's Shouchun rebellion [c:16691] proved the structurally fatal blow: the clan members who held the most military authority were no longer loyal to the Wu imperial house. Sun Chen seized on this moment and moved, needing almost no large-scale force to do so.
Core Issues
This episode highlights a deep structural contradiction in Sunwu's politics: in the absence of a stable civil-official system, Sun Quan and his successors had long relied on a dual-track structure of "imperial clan plus consort clan" to check powerful ministers, but once this structure was torn open by an external event — such as the Zhuge Dan rebellion — the entire defensive mechanism collapsed. The Quan clan was not overwhelmed by Sun Chen in a single assault; it imploded politically only after its own members had first stripped away its military power. In other words, the core dynamic of this case was not "a strongman overpowering the emperor" but "the consort-clan ecosystem on which the emperor's survival depended suddenly haemorrhaging."
Political Consequences
Sun Liang was first demoted to Prince of Huiji, then reduced to Marquis of Houguan, and ultimately ended his days at Houguan (present-day Minhou, Fujian); Empress Quan followed him there, while Quan Shang was sent into exile at Lingling and killed by pursuers along the way [c:16691]. The short-term impact was Sun Chen's complete domination of the Jianye court and his installation of Sun Xiu as the new emperor, inaugurating a second period of strongman regency in Wu. The medium-term impact was the marginalisation of the prominent Wu-region families as a whole, further compressing the social base of the Wu central government to the imperial clan and a handful of military households. The long-term impact was that throughout Sun Xiu's reign the emperor had to rely on old generals such as Ding Feng and Zhang Bu simply to rebuild a semblance of imperial authority, and the consort clans never again recovered the political weight they had carried under Sun Liang.
Counterfactual Analysis
If Quan Yi, Quan Duan, and the other Quan kinsmen had not defected to Wei at the Shouchun campaign, Sun Chen — even if intent on deposing the emperor — would have faced a consort clan that still wielded military power, and the opportunity might have been postponed by several years; every additional year of delay would have given Sun Liang a greater chance to reach maturity and cultivate his own base. Of course the deeper problems of Sunwu's politics — early death of emperors, repeated instability over succession, imperial clan and strongmen alternating in dominance — would not have dissolved simply because one or two consort-clan families retained their power; but the situation at least would not have crystallised so dramatically into the spectacle of "an emperor deposed at sixteen." The most enduring lesson this episode leaves for posterity is: when a regime's legitimacy is bound tightly to a single family, any act of internal defection by that family will be amplified into a constitutional crisis.