Answer
Zhang Fei was Guan Yu's other sworn brother, forming a legendary trio with Liu Bei. They pledged brotherhood in the Peach Garden, vowing to support each other through life and death. Zhang Fei was known for his fierce loyalty, bravery, and impetuous nature. Together with Guan Yu, they played a pivotal role in Liu Bei's quest to establish the Shu Han kingdom during the Three Kingdoms period.