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the Yongle Emperor conferred the surname "Zheng" to Ma He, because he had distinguished himself defending the city reservoir Zhenglunba against imperial forces in the Siege of Beiping. Another reason was that the eunuch commander also distinguished himself during the campaign to capture the capital Nanjing It is believed that his choice to confer the surname "Zheng" was because the eunuch's horse had been killed during the battle at Zhenglunba near Beiping at the onset of his rebellion