Geng Yan (; 3–58 AD) was a Chinese general of the Eastern Han dynasty. Courtesy name Bo Zhao, he was a native of Maoling, Fufeng Commandery He was the son of (耿況), who was the governor of Shanggu Commandery (上谷, roughly modern Zhangjiakou, Hebei). He initially served Emperor Guangwu of Han as clerk; later, he was a renowned general and military strategist of the Eastern Han dynasty.
Geng Yan persuaded his father, Geng Kuang, to support Liu Xiu, assisting him in securing elite cavalry from Shanggu and Yuyang. Fighting across various regions, he was appointed as a Grand General by Emperor Guangwu at the age of 22. Later, he was tasked with leading an eastern campaign, employing strategies such as besieging cities, feigning attacks, and conserving strength to defeat Zhang Bu, ultimately pacifying the Qi region. Geng Yan "conquered 46 commanderies and conquered 300 cities, never suffering a defeat". Emperor Ming honored Throughout his career, Geng among those who had served his father well by painting their portraits on a palace tower (雲台二十八將, 28 Generals of Yuntai); Geng's portrait was placed in the fourth position.
Biography Geng Yan, studious from a young age, mastered the Confucian classics under his father, , the Commandant of Shuodiao (equivalent to the Governor of Shanggu Commandery under the Xin dynasty).This was an official title under the Xin dynasty, equivalent to the Governor of Shanggu Commandery. Observing the commandery’s military examinations, which involved setting up flags and practicing horseback archery, he developed a passion for military affairs.
In the first year of the Gengshi Emperor (23 AD), after the emperor ascended the throne and Wang Mang was killed, Geng Kuang, uneasy as a Wang Mang-appointed official, sent Geng Yan as an envoy with tribute from Shanggu to Chang'an to pay homage to the Gengshi Emperor, seeking to secure his position. In December, while traveling through Songzi, the warlock Wang Lang proclaimed himself Liu Ziyu, the lost heir of Emperor Cheng of Han, and raised an army in Handan. Geng Yan’s attendants, Sun Cang and Wei Bao, believed Wang Lang was legitimate and urged him to join. Geng Yan, gripping his sword, declared: “Once I reach Chang’an, I will explain the utility of Shanggu and Yuyang’s cavalry. Returning via Taiyuan and Dai Commandery will take mere tens of days. With elite cavalry, we’ll crush this rabble like dry leaves. Your lack of judgment will lead to your clans’ destruction.” Sun Cang and Wei Bao ignored him and defected to Wang Lang.
Recruiting Troops in Yan Hearing that the Gengshi Emperor’s Acting Grand Marshal Liu Xiu was in Lunu, Geng Yan rode north to meet him. Liu Xiu appointed him as a Gatekeeper Attendant. Geng Yan seized the opportunity to persuade the Military Protector to let him recruit troops to attack Handan. Liu Xiu, amused, said: “This young man has grand ambitions!” and frequently met with him, offering encouragement. Geng Yan wrote to his father, praising Liu Xiu’s vision and strategy, urging him to meet Liu Xiu soon. Geng Kuang traveled to Changping and sent his youngest son, , to present horses to Liu Xiu.
In January of the second year of Gengshi (24 AD), Geng Yan followed Liu Xiu north to Ji. Hearing that Wang Lang’s forces were approaching, Liu Xiu planned to retreat south and consulted his officers. Geng Yan said: “With the enemy approaching from the south, we cannot go that way. , the Governor of Yuyang, is your townsman; my father is the Governor of Shanggu. By mustering ten thousand cavalry from these two commanderies, Handan’s forces are no concern.” Liu Xiu’s officers retorted: “The dead are buried facing south; why head north into a trap?” Liu Xiu, pointing at Geng Yan, said: “This is the master of my northern path.”
When Liu Jie, son of , rebelled in Ji, causing chaos, Liu Xiu fled south, while Geng Yan escaped north to Changping to join his father. Geng Yan and Geng Kuang issued a proclamation and combined forces. Convincing his father, Geng Yan sent the Merit Officer to ally with , the Governor of Yuyang. Each commandery dispatched 2,000 cavalry and 1,000 infantry. Geng Yan, alongside Shanggu’s Chief Clerk , Merit Officer Kou Xun, and Wu Han leading Yuyang’s forces, attacked Wang Lang’s generals, Nine Ministers, and colonels, killing over 400 and pacifying 22 counties, including Zhuo, Zhongshan, Julu, Qinghe, and Hejian. When their forces reached Guang’a, rumors of Wang Lang’s army caused alarm. Liu Xiu personally led troops to the city walls, sending scouts to investigate. Wu Han clarified: “We are Shanggu’s troops joining Liu.” Liu Xiu’s forces rejoiced. Liu Xiu asked: “Has Geng Yan found his allegiance?” Geng Yan bowed beneath the walls, detailing the troop deployment. Liu Xiu summoned them, laughing: “Handan’s generals boasted of mustering Yuyang and Shanggu troops. I casually responded, ‘I’ll muster them too.’ Who knew these commanderies would truly come for me! Together, we’ll achieve fame.” Geng Yan was appointed Lieutenant General, retaining command of his troops, and followed Liu Xiu to conquer Handan.
Seeing Liu Xiu’s growing prestige, the Gengshi Emperor appointed him King of Xiao, ordering him to disband his army and return to Chang’an with his generals. The emperor sent as Governor of Youzhou, Wei Shun as Governor of Shanggu, and Cai Chong as Governor of Yuyang. Residing in Handan’s palace, Liu Xiu rested in the Wenming Hall by day. Geng Yan entered, approaching his bedside, and advised: “The Gengshi Emperor’s rule is faltering, with generals seizing power in the capital’s outskirts and nobles acting recklessly. Imperial orders don’t leave the city gates, and governors are arbitrarily replaced. The people cannot adapt, and scholars fear for their safety. Bandits rob wealth and women; those carrying treasures cannot return home alive. The people lament, yearning for Wang Mang’s Xin dynasty. Bands like Tongma and Chimei, numbering tens to hundreds of thousands, roam freely. The Gengshi Emperor cannot subdue them and will soon fail. You rose in Nanyang, defeating a million enemies; now, securing Hebei, you hold this land of abundance. With righteousness, conquer the four directions and issue commands—the realm can be pacified by proclamation. This critical opportunity must not fall to others. The emperor’s envoy urges you to disband; this must not be heeded. Our troops have suffered losses and desertions. I request to return to Youzhou to muster elite troops for your grand plan.” Liu Xiu, delighted, appointed Geng Yan as Grand General, sending him north with Wu Han to recruit Youzhou’s ten commandery troops. Geng Yan returned to Shanggu, arrested and executed Wei Shun and Cai Chong, while Wu Han killed Miao Zeng, enabling them to muster Youzhou’s forces and march south.
Strategic and Martial Prowess In autumn and winter, Geng Yan followed Liu Xiu to defeat the Tongma, Gaohu, Chimei, and Qingdu armies. In spring of the first year of Jianwu (25 AD), he pursued Youlai, Daqiang, and Wufan to Yuanshi. In repeated battles, Geng Yan often led elite cavalry as the vanguard, consistently breaking and routing enemies. Liu Xiu fought at Shunshui’s northern bank, but as the enemy fought desperately, his exhausted troops suffered a major defeat. They held Fanyang, regrouping after days, and the enemy retreated. Geng Yan followed Liu Xiu, chasing the enemy to Rongcheng, Xiao Guangyang, and Anci, defeating them in successive battles. Returning to Ji, Geng Yan, alongside , Ma Wu, , , , , , , , Zhai Zun, , and Wang Ba, followed Wu Han to pursue rebels to Luodong and Pinggu, engaging and beheading over 13,000, chasing them to Wuzhong and Tuyin in Right Beiping, then to Junmi before returning. The rebels scattered to Liaoxi and Liaodong, where they were nearly annihilated by the Wuhuan and Mo people.
On June 22, 25 AD, Liu Xiu ascended as emperor. Geng Yan was appointed Grand General of Jianwei. At the time, the imperial clan member gathered forces between Jing and Mi, proclaiming himself General厌新, conquering Yingchuan and Runan with over 100,000 men. Geng Yan, with Cavalry General and Crossbow General , attacked them at Aocang, defeating and subduing them. Liu Mao surrendered and was made King of Zhongshan. On July 22, 25 AD,The Book of the Later Han likely erred, as there was no ''jihai'' day in the seventh month of Jianwu’s first year. Emperor Guangwu reached Huai, sending Geng Yan and Crossbow General Chen Jun to garrison Wushejin, securing defenses east of Xingyang, while Wu Han led eleven generals to besiege in Luoyang. On February 22, 26 AD, Emperor Guangwu ennobled his meritorious vassals as marquesses, elevating Geng Yan to Marquess of Haozhi.His original marquess title is unknown.
In February of the third year of Jianwu (27 AD), under Grand Marshal Wu Han, Geng Yan and Tiger Fang General defeated the Qingdu rebels at Zhixi. In April, Emperor Guangwu personally campaigned, and surrendered. Though the emperor wished to pardon him, Geng Yan and remonstrated, and Deng Feng was executed. In June, attacked Nanyang from Wuguan, capturing several cities, with Du Hong of Rang leading a following. Geng Yan fought Yan Cen’s forces at Rang, defeating them, beheading over 3,000, capturing over 5,000 soldiers, and seizing 300 seals. Du Hong surrendered, and Yan Cen fled to Dongyang with a few cavalry.
Suppressing Rebellions in Hebei On October 25, Geng Yan accompanied Emperor Guangwu to Chunling, offering a plan to recruit Shanggu troops to attack the rebellious in Yuyang and in Zhuo Commandery, subdue the Fuping and Huosuo rebels, and then march east to defeat Zhang Bu to pacify Qi. The emperor, impressed by his ambition, approved.
In 28 AD, Geng Yan, with General of Subjugation Ji Zun, General of Righteousness Zhu Hu, and Cavalry General Liu Xi, was ordered to attack Zhang Feng in Zhuo Commandery. Ji Zun arrived first, defeating Zhang Feng. Ordered to attack Yuyang, Geng Yan, noting Peng Chong’s comparable merits to his father and lacking siblings in Luoyang, hesitated to advance alone and requested an audience in Luoyang. Emperor Guangwu decreed: “As a general, your family serves the state loyally, defeating enemies wherever you go, with immense merit. What suspicion requires an audience? For now, garrison Zhuo Commandery with , and devise strategies to advance.” Hearing of Geng Yan’s request, Geng Kuang, uneasy, sent Geng Yan’s brother to Luoyang. The emperor treated Geng Guo kindly, appointing him Gentleman of the Yellow Gate and ennobling Geng Kuang as Marquess of Yumi. was also made Marquess of Muping.
In 29 AD, Peng Chong was defeated. Emperor Guangwu sent Grand Master of Splendid Happiness to Shanggu to escort Geng Kuang to the capital, granting him prime lodging and court attendance. Geng Yan and Wang Chang, following Wu Han, defeated the Fuping and Huosuo rebels at Pingyuan, with over 40,000 surrendering, and pursued remnants to Bohai, where over 10,000 surrendered. The emperor then ordered Geng Yan to advance against Zhang Bu.
Conquering All of Qi Geng Yan led his army east against Zhang Bu, appointed King of Qi by Liu Yong. Geng Yan organized surrendered troops, appointed officers, and led Taishan Governor and Cavalry Commandant across the Ji River via a Chaoyang bridge. Hearing this, Zhang Bu appointed General Fei Yi as King of Jinan, stationed at Lixia, with troops at Zhua and dozens of camps at Taishan’s Zhongcheng to await Geng Yan.