Wang Kang was a high-ranking official of the kingdom of Shu Han - one of the three kingdoms in Chinese history. Being an upright and honest official, he was deeply respected by the people. He was given the title of An Ji Shen Wang (Ang Chee Sia Ong) after his death and a temple was built to honour him. Green snakes were often spotted at the temple and when the people of Chao Shan saw one at the battlefield, they would invariably emerge victorious.

They believed that the green snake was the transformation of Ang Chee Sia Ong, whose spirit provided a protection of them against disasters. Hence Ang Chee Sia Ong was also known as Sacred Lord Green Dragon (Qing Long Shen Wang) and the temple, Qing Long Gu Miao.