Zhang Su

Historical Record

Zhang Su, courtesy name Junjiao, was an Aide-de-camp under the Governor of Yi Province, Liu Zhang. During the Jian'an era, after Cao Cao had campaigned against Jing Province and already pacified Hanzhong, Liu Zhang sent an envoy, Yin Pu of Henei, to pay his respects to Cao Cao. Subsequently, Liu Zhang sent Zhang Su as Aide-de-camp to present to Cao Cao three hundred Sou troops and various imperial provisions.^[1] Cao Cao accordingly appointed Zhang Su Administrator of Guanghan, which shows that Zhang Su played an important role in the political dealings of the time and won Cao Cao's recognition.

After Zhang Su, Liu Zhang sent Zhang Su's brother Zhang Song to Cao Cao. By then, however, Cao Cao had settled Jing Province and defeated Liu Bei, so he did not value Zhang Song, which made Zhang Song resentful. After Cao Cao met with reverses at Chibi and suffered heavy losses from plague, Zhang Song returned to Yi Province and roundly slandered Cao Cao, urging Liu Zhang to break off relations with him.^[1] Zhang Song further advised Liu Zhang to form ties with Liu Bei, calling Liu Bei a "bosom friend" of Liu Zhang. Liu Zhang adopted Zhang Song's advice and sent Fa Zheng to befriend Liu Bei, and then sent Fa Zheng and Meng Da to lead several thousand troops to assist Liu Bei in his defense. Once his task was done, Fa Zheng returned to Yi Province.

Afterward, Zhang Song again advised Liu Zhang, pointing out that within Yi Province, generals such as Pang Xi and Li Yi presumed upon their merits and grew arrogant, and might harbor disloyal intentions; if Liu Bei were not brought in, Liu Zhang would face the predicament of attack from foreign enemies and rebellion from the people within. Liu Zhang once again heeded Zhang Song's advice and sent Fa Zheng to invite Liu Bei into Shu. Although the Registrar Huang Quan set out the harms and the Guanghan Attendant Officer Wang Lei even hung himself upside down at the prefectural gate to remonstrate to the death, Liu Zhang accepted none of it; instead, he ordered every district to provide Liu Bei with lavish supplies, so that Liu Bei entered the territory as if returning home.^[1] Liu Bei reached the north of Jiangzhou, passed by way of the Dianjiang waters to Fucheng, three hundred and sixty li from Chengdu. In the sixteenth year of Jian'an, Liu Zhang led more than thirty thousand foot and horse, with carriages and curtains glittering brilliantly in the sun, to meet with Liu Bei. Liu Bei's officers and men mingled with Liu Zhang's troops, feasting joyfully for more than a hundred days. Liu Zhang supplied Liu Bei with two hundred thousand hu of rice, a thousand horses, a thousand carriages, and silks and brocades, so that he might campaign against Zhang Lu, after which the two parted.^[1] In this whole series of events, Zhang Su, as Zhang Song's elder brother, his position and role in Liu Zhang's regime, and his kinship with Zhang Song all formed part of the political landscape of Yi Province at the time. Although the historical sources do not directly record Zhang Su's specific actions during Zhang Song's persuasion of Liu Zhang to bring in Liu Bei, as Administrator of Guanghan he was undoubtedly an important local official within Yi Province during this period.

In the Novel

In Romance of the Three Kingdoms, Zhang Su's image is given a more dramatic coloring, especially at the critical moment when his brother Zhang Song secretly plotted to offer Shu to Liu Bei. In the novel, Zhang Su is depicted as Administrator of Guanghan, consistent with the historical record.^[2] However, the novel highlights how he discovered Zhang Song's betrayal of Liu Zhang and secret dealings with Liu Bei, making it an important turning point that led to Zhang Song's eventual death and Liu Bei's mastery of Yi Province.

In the novel, when Liu Bei feigned a wish to return to Jing Province, Zhang Song mistook it for the truth and wrote a letter intending to send it to Liu Bei, urging him to advance his troops quickly. Just then Zhang Su came to visit; Zhang Song hastily hid the letter in his sleeve and made conversation with his elder brother. Zhang Su noticed that Zhang Song seemed distracted and grew suspicious. As Zhang Song and Zhang Su drank together, Zhang Song inadvertently dropped the letter on the floor, where it was picked up by Zhang Su's attendant. After the banquet broke up, the attendant presented the letter to Zhang Su. When Zhang Su opened it, the contents made clear that Zhang Song had given counsel to Liu Bei and was urging Liu Bei to advance quickly, that Zhang Song would act as an inside agent, and it stressed: "To seize by force and hold by compliance was prized by the ancients. Now that the great matter is already within our grasp, why would you abandon this and return to Jing Province?"^[2]

On seeing this letter, Zhang Su was aghast, regarding Zhang Song's act as "a matter that would destroy the whole clan" that must be reported at once. He presented the letter to Liu Zhang that very night, explaining in detail the true facts of Zhang Song's conspiracy with Liu Bei to offer up the Western River region.^[3] On hearing this, Liu Zhang was furious, asking why Zhang Song would seek to rebel when he had never treated Zhang Song badly. So Liu Zhang ordered the arrest of Zhang Song's entire family and had them beheaded as a public warning.^[3] This episode has no clear basis in the historical sources and is an artistic creation by the novel to heighten conflict and the dramatic force of the characters' fates. Through Zhang Su's denunciation, the novel not only advances the plot but also casts Zhang Su as loyal to Liu Zhang and willing to destroy kin for the greater good—even though this act ultimately hastened the collapse of Liu Zhang's regime.

Key Relationships

* Cao Wei (defected_to): In the historical record, Zhang Su once served as Liu Zhang's envoy, presenting troops, horses, and supplies to Cao Cao, and was thereby appointed by Cao Cao as Administrator of Guanghan.^[1] This shows that Zhang Su had to some degree contact and political dealings with Cao Cao's regime and won his recognition, though this was not "defection" in the traditional sense.
* Zhang Song (kin_of): Zhang Su and Zhang Song were brothers. In the historical record, Zhang Song too went as an envoy to Cao Cao after Zhang Su, but because he was not valued he grew resentful and turned to advising Liu Zhang to ally with Liu Bei. In the novel, Zhang Su directly exposed Zhang Song's scheme of secret dealings with Liu Bei to offer up Shu, leading to Zhang Song's death.^[3] This opposition and conflict between brothers is an important stroke in the novel's depiction of character relationships.
* Liu Zhang (witnesses): Zhang Su was an important official under Liu Zhang, having served as Aide-de-camp and Administrator of Guanghan. He was not only Liu Zhang's envoy to Cao Cao but also an important part of Liu Zhang's regime. In the novel, Zhang Su directly denounced Zhang Song's betrayal to Liu Zhang, becoming a witness to and participant in the conflict of loyalty and betrayal within Liu Zhang's regime.^[3]

Iconic Scenes

* Envoy to Cao Cao, enfeoffed as Administrator of Guanghan: This is Zhang Su's most clearly attested political activity in the historical sources. As Liu Zhang's representative, he presented tribute to Cao Cao and was thereby appointed by Cao Cao as Administrator of Guanghan.^[1] This scene reflects Zhang Su's standing in Liu Zhang's regime and his indirect connection with Cao Cao's regime.
* Denouncing Zhang Song, destroying kin for the greater good: This is Zhang Su's best-known iconic scene in Romance of the Three Kingdoms. After discovering the letter in which his brother Zhang Song plotted with Liu Bei to offer up Shu, Zhang Su, deeply alarmed at the gravity of the matter, denounced Zhang Song's betrayal to Liu Zhang that very night, leading to Zhang Song's arrest and beheading.^[3] This scene not only displays Zhang Su's allegiance to Liu Zhang but also foreshadows Liu Bei's eventual seizure of Yi Province—a moment of intense dramatic conflict and moral choice in the novel (unique to the novel).
* Witnessing Yi Province's political upheaval: Whether in the historical record or the novel, Zhang Su lived through the critical period when the Yi Province regime passed from Liu Zhang's rule to Liu Bei's takeover. He personally witnessed a series of political shifts—from Liu Zhang's friendly relations with Cao Cao, to his alliance with Liu Bei, to the eventual loss of Yi Province. As Administrator of Guanghan, he was undoubtedly a participant in and witness to these historical events.^[1]