Zhang Yi was a prominent military general and strategist during the late Han Dynasty in ancient China. He is best known for his role in the Three Kingdoms period, where he served under the warlord Cao Cao. Zhang Yi was recognized for his tactical skills and ability to lead troops effectively in various battles. In addition to his military prowess, Zhang Yi was also known for his diplomatic skills. He played a crucial role in negotiating alliances and managing relationships between different factions during a time of political turmoil. His contributions significantly impacted the power dynamics of the era.