Zhang Yun was a military general serving under the warlord Liu Biao

Liu Biao

Liu Biao , style name Jingsheng , was a warlord and the governor of Jing Province during the late Han Dynasty period of Chinese history. He was a member of the extended family of the Han Dynasty emperors...

 during the late Han Dynasty

Han Dynasty

The Han Dynasty was the second imperial dynasty of China, preceded by the Qin Dynasty and succeeded by the Three Kingdoms . It was founded by the rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han. It was briefly interrupted by the Xin Dynasty of the former regent Wang Mang...

 period of Chinese history

History of China

Chinese civilization originated in various regional centers along both the Yellow River and the Yangtze River valleys in the Neolithic era, but the Yellow River is said to be the Cradle of Chinese Civilization. With thousands of years of continuous history, China is one of the world's oldest...

. He was Cai Mao

Cai Mao

Cai Mao was a military general specializing in naval warfare during the late Han Dynasty era of Chinese history. He was from Xiangyang in Jing Province and originally served the warlord Liu Biao before joining Cao Cao's forces. He gained his status when his sister married Liu Biao.Cai Mao initially...

's maternal nephew and specialized in naval warfare like his uncle. They pledged allegiance to the warlord Cao Cao

Cao Cao

Cao Cao was a warlord and the penultimate chancellor of the Eastern Han Dynasty who rose to great power during the dynasty's final years. As one of the central figures of the Three Kingdoms period, he laid the foundations for what was to become the state of Cao Wei and was posthumously titled...

 when Liu Cong surrendered to Cao after Liu Biao's death.

In fiction

In Luo Guanzhong

Luo Guanzhong

Luo Ben , better known by his style name Luo Guanzhong , was a Chinese writer of the early Ming Dynasty period of Chinese history. He was also known as Huhai Sanren...

's historical novel Romance of the Three Kingdoms

Romance of the Three Kingdoms

Romance of the Three Kingdoms, written by Luo Guanzhong in the 14th century, is a Chinese historical novel based on the events in the turbulent years near the end of the Han Dynasty and the Three Kingdoms era of Chinese history, starting in 169 and ending with the reunification of the land in...

, Zhang Yun and Cai Mao were appointed by Cao Cao as his naval admirals during the Battle of Red Cliffs

Battle of Red Cliffs

The Battle of Red Cliffs, otherwise known as the Battle of Chibi, was a decisive battle at the end of the Han Dynasty, immediately prior to the Three Kingdoms period of Chinese history. It was fought in the winter of 208/9 AD between the allied forces of the southern warlords Liu Bei and Sun Quan...

. Cao fell for a ruse by Zhou Yu

Zhou Yu

Zhou Yu was a military general and strategist who served his close friend, the warlord Sun Ce, during the late Han Dynasty period of Chinese history...

and had Zhang and Cai executed after mistakenly believing that they were planning to assassinate him.