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Wu Ban was a son of Wu Kuang (吳匡), an official who served under the general He Jin during the reign of Emperor Ling ( 168–189) in the Eastern Han dynasty. Like his older relative Wu Yi, he served as a military general in the state of Shu Han during the Three Kingdoms period and held appointments/positions which were second to those held by Wu Yi. He was known for being bold and chivalrous. During the short reign of Liu Bei ( 221–223), the founder and first emperor of Shu, Wu Ban served as a "lingjun" (領軍; a military commander).