the Key to the north Gate of Beijing
On the outside of the Guan city gate, there is rectangle plaque with 4 Chinese characters "Bei Men Suo Yue ", meaning of "the Key to the north Gate of Beijing ", and the small inscribing characters are "Imperial Envoy, Stadholder of military affairs in Ji and Liao regions etc. Minister of the Arms Ministry, Left Vice Supervision Supreme Censor Aokun,established in May, Year of Yinwu, the lengh tenth year of Wanli". "Bei Men" in English North Gate means that the place is the northern gate of Beijing; "Suo Yue" in English the key means tha Guan city has a strategic position and is the key location.
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