铁面御史

Explanation: Zhao Bian Shi Yu Song for the history of the house, impeachment powerful, outspoken and selfless, known as "Impartial Censor." Pan said after the powerful fear, swayed by personal considerations, strict justice officials. 　　Source: "History of the Song Chuan Zhao Bian," Imperial Academy was not the light of public knowledge, recommended to the house of Shi Yu Shi, fortunately right not to avoid impeachment, claiming that awe-inspiring, the capital project for the 'Impartial Censor.' "