One person worth mentioning in the history of Shu-Han is Guan Yu, one of Liu Bei，s sworn brothers，who was regards as a model of devotion in Chinese culture.
He was a man of keeping his words and loyalty to his friends in his life： after promising to fight with Liu Bei and becoming his sworn brother, Guan Yu by no means changed his mind until fought to death in Maicheng city.
In 199, while Liu Bei turned against Cao Cao and fled to Xuzhou (now Jiang Su province)， Guan Yu was left in Xiapi city to function as the governor.
In 200，Cao Cao seized Xuzhou, in confusion, Liu Bei and Zhang Fei escaped, Guan Yu was forced to surrender for protecting the wives and children of Liu Bei.
Admiring him greatly, Cao Cao knighted Guan Yu as his intimate followers and sent Zhang Liao, one of his generals, to probe whether Guan Yu meant to fight for him. Guan Yu answered clearly that： ul do appreciate the kindness of Cao Cao. However, I have accepted the honor granted by Liu Bei and sworn to live and die for him. I can never betray what I committed, and therefore I will leave once I obtain the trace of Liu Bei. Nevertheless, I will contribute to Cao Cao as a return for his generosity before leave.
M Upon hearing these words, Cao Cao was deeply moved by Guan Yu ’ s devotion and not angry with him.
Before the battle of Guan Du, Yuan Shao * s general Yan Liang was sent to attack Liu Yan at Bai Ma and at the crucial moment, Guan Yu and Zhang Liao was ordered to rescue the city.
Arriving at the battlefield, seeing Yan Liang ’ s banner in far distance，Guan Yu stroked his horse and dashed ahead, beheaded him at one round and defeated his armies.
Cao Cao recommended to Han Xiandi to grant Guan Yu as Shouting Hou, the highest position among the generals in hoping that Guan Yu might work for him.
In 200, after getting the message of Liu Bei, Guan Yu wrote a letter to Cao Cao and left with all the rewards in intad. Cao Cao ’ s generals meant to chase and capture Guan Yu，Cao Cao said ‘‘ let him go，he serve merely his own master”
Guan Yu was the only God worshiped by Buddhism, Daoism and Confucianism in China ： Buddhism regards him as the protector of the Buddha dharma ； and he was the symbol of devotion and fidelity being honored as Guandi Sheng Jun (the holy person) in Daoism and Confucianism.
Till now, there are still many admirers and believers in Guandi Temple all over the country.