Bao Zheng, commonly known as Bao Gong, was a Chinese politician during the reign of Emperor Renzong in China's Song Dynasty. During his twenty-five years in civil service, Bao was known for his honesty and uprightness, with actions such as impeaching an uncle of Emperor Renzong's favourite concubine and punishing powerful families. His appointment from 1057 to 1058 as the prefect of Song's capital Kaifeng, where he initiated a number of changes to better hear the grievances of the people, made him a legendary figure. During his years in office, he gained the honorific title Justice Bao due to his ability to defend peasants and commoners against corruption or injustice. Bao Zheng is depicted as the incarnation of the Astral God of Civil Arts, while another protagonist — famous Northern Song warrior Di Qing as the Astral God of Military Arts.

Gong'an or crime-case fiction is a subgenre of Chinese crime fiction involving government magistrates who solve criminal cases. Gong'an fiction first appeared in the colloquial stories of Song dynasty. Gong'an fiction was then developed and become one of the most popular fiction styles in Ming and Qing dynasties. The Judge Dee and Judge Bao stories are the best known examples of the genre.