One sentence: 'From Zhong Ding onward the legitimate heir was set aside and younger brothers and sons were set up instead; the younger brothers and sons sometimes fought to succeed one another, and for nine generations there was disorder, so the lords no longer came to court' (自中丁以來，廢適而更立諸弟子，弟子或爭相代立，比九世亂，於是諸侯莫朝). Nine reigns of Shang politics compressed into one chain of cause and effect. The trouble is that the same chapter goes on recording succession by younger brother after that sentence.

How the Genealogy Is Written

The Shiji's Shang chapter runs king by king, each in a formula: 'Tang died; the heir Tai Ding died before reigning, so Tai Ding's younger brother Wai Bing was set up'; 'Wai Bing reigned three years and died, and Wai Bing's younger brother Zhong Ren was set up'; 'Zhong Ren reigned four years and died, and Yi Yin set up Tai Ding's son Tai Jia' — Tai Jia being Tang's eldest grandson. Then: Tai Jia died, his son Wo Ding; Wo Ding died, his younger brother Tai Geng; Tai Geng died, his son Xiao Jia; Xiao Jia died, his younger brother Yong Ji; Yong Ji died, his younger brother Tai Wu; Tai Wu died, his son Zhong Ding. Younger brother and son alternate from the very beginning. This was not a change made on some particular day.

From Zhong Ding to Yang Jia lies the 'nine generations'. Entry by entry: Zhong Ding died, his younger brother Wai Ren; Wai Ren died, his younger brother He Dan Jia; He Dan Jia died, his son Zu Yi; Zu Yi died, his son Zu Xin; Zu Xin died, his younger brother Wo Jia; Wo Jia died, and Wo Jia's elder brother Zu Xin's son Zu Ding was set up; Zu Ding died, and his younger brother Wo Jia's son Nan Geng was set up; Nan Geng died, and Zu Ding's son Yang Jia was set up. In between come the notes 'in He Dan Jia's time Yin declined again' and 'in Yang Jia's time Yin declined'. Only then the summary sentence.

The Nine and the Disorder

Which nine generations? The text does not name them. Counting the genealogy, Zhong Ding through Yang Jia is exactly nine kings — but that count is the reader's, not a list the Shiji supplies. So this article says 'from Zhong Ding to Yang Jia, nine kings', and does not present it as the book's own roster.

'Setting aside the legitimate heir and setting up younger brothers and sons instead' is an explanation; the next clause, that they 'fought to succeed one another', is about rivalry. Both are the historian's verdict, not a Shang statute, oath or accession record. What the sentence proves is that this is how the history explains the period, not that Shang kings were bound by such a rule.

More important is what follows the sentence. Yang Jia died and his younger brother Pan Geng took the throne; Pan Geng moved to Yin, followed Tang's government, and 'the way of Yin revived'; Pan Geng died and his younger brother Xiao Xin succeeded; Xiao Xin died and his younger brother Xiao Yi; Xiao Yi died and his son Wu Ding. Later still, Zu Geng died and his younger brother Zu Jia succeeded; Lin Xin died and his younger brother Geng Ding. Brother-to-brother succession keeps appearing after the 'disorder' as well. The neat story — chaos, then a shift to father-to-son — is not what this chapter shows; the only boundary is the sentence itself.

The Zhou Court's Other Account

The other book counts something else. In the Shujing's 'Against Idleness', the Duke of Zhou tells King Cheng of Zhou: 'Formerly, in the time of Zhong Zong of Yin, he was grave and reverent, revering Heaven's mandate, governing the people in awe and daring not to indulge in idleness: thus Zhong Zong held the state seventy-five years. As for Gao Zong, he had long laboured outside and known the lesser people; when he took the throne he kept silent three years… thus Gao Zong held the state fifty-nine years. As for Zu Jia, he did not think himself fit to be king and had been a lesser man; when he took the throne he understood the people's reliance and could protect the common folk, not daring to insult widowers and widows: thus Zu Jia held the state thirty-three years. After that time the kings set up were idle from birth… and after that time none could reach old age: some ten years, some seven or eight, some five or six, some three or four' (或十年，或七八年，或五六年，或四三年).

What he counts is 'holding the state' — years on the throne — not ages. The speaker is the Duke of Zhou; the audience is the king of Zhou; the Yin past is material for an argument about not idling. Read as Shang evidence about succession, it points the wrong way. And the two pages collide directly over Zu Jia: this speech places him among the four who 'followed wisdom', with thirty-three years on the throne, while the Shiji says 'Emperor Jia was licentious and disorderly, and Yin declined again'. One king, a wise ruler in one page and a bad one in the other. This article records both and settles neither.

What Can and Cannot Be Written

Three things cannot be written: that 'the Shang practised brother-to-brother succession' — here there is only a genealogy; that 'after the nine generations father-to-son was established' — the same chapter keeps the brother succession afterwards; and that the Shujing speech is Shang evidence — it is the Duke of Zhou's admonition. What can be written: this is how this book tells it, and the explanation it offers; and this is how the Zhou court counted reigns.

There is one more layer. 'Nine generations of disorder' is a compressed verdict: it turns nine reigns into a chain — set aside the heir, fight for the throne, disorder, the lords stay away — while every particular is missing: who fought, who was installed, whether outside powers intervened. The lords 'no longer came to court' are not named either. It reads like a piece of historical argument, not a record.

What Is Not Here

No Shang text setting out the rules of succession; no formal list of the 'nine generations'; no reason for any single accession; no evidence that the lords actually stopped coming. The oracle-bone sacrificial sequences could check the order of kings, but they are not among the two pages used here and this article does not reach for them. So what is written here is how one book tells Shang succession, not a history of the Shang institution.

Related reading：Fifty Disciples: The Han Academy That Was an Appointment Pipeline · The Day Was Divined, the Night Was Not: Two Ways of Asking in Spring and Autumn China · One Script for the Empire: A Decree and an Explanation Three Centuries Later

Sources & further reading

  1. 司马迁《史记》卷三·殷本纪（西汉；维基文库本，未与点校本复核） — The only one of these two pages that narrates Shang royal succession. It runs king by king in a fixed formula — 'X died; his son Y was set up', 'X died; his younger brother Y was set up' — and the alternation begins at the start: Tang's heir Tai Ding died before reigning, so Tai Ding's younger brother Wai Bing was set up; Wai Bing died and his younger brother Zhong Ren followed; Zhong Ren died and Yi Yin set up Tai Ding's son Tai Jia, the eldest grandson. From Zhong Ding to Yang Jia the entries give a run of younger-brother and nephew successions, after which the chapter says: 'From Zhong Ding onward the legitimate heir was set aside and younger brothers and sons were set up instead; the younger brothers and sons sometimes fought to succeed one another, and for nine generations there was disorder, so the lords no longer came to court' (自中丁以來，廢適而更立諸弟子，弟子或爭相代立，比九世亂，於是諸侯莫朝). The same chapter then continues to record succession by younger brother after this passage — Yang Jia to Pan Geng, Pan Geng to Xiao Xin, Xiao Xin to Xiao Yi — and again later (Zu Geng to Zu Jia, Lin Xin to Geng Ding). It gives no law of succession, no reason for any individual accession, and no list of the 'nine generations'.
  2. 《尚书·无逸》（周初；维基文库本，未与点校本复核） — A speech by the Duke of Zhou to King Cheng of Zhou, not a Shang document. He recalls the Yin kings: 'Formerly, in the time of Zhong Zong of Yin, he was grave and reverent, revering Heaven's mandate, governing the people in awe and daring not to indulge in idleness; thus Zhong Zong held the state seventy-five years. As for Gao Zong, he had long laboured outside and come to know the lesser people; when he took the throne he kept silent for three years… thus Gao Zong held the state fifty-nine years. As for Zu Jia, he did not think himself fit to be king and had been a lesser man; when he took the throne he understood the people's reliance and could protect and benefit the common folk, not daring to insult widowers and widows; thus Zu Jia held the state thirty-three years. After that time, the kings who were set up were idle from birth… and after that time none could reach old age: some ten years, some seven or eight, some five or six, some three or four' (周公曰…肆中宗之享國七十有五年…五十有九年…三十有三年…或十年，或七八年，或五六年，或四三年). The speech gives reign lengths, not rules of succession, and it names three good kings and 'our King Wen' as the four who followed wisdom.