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In 1355, during the Mongol Dynasty, Han Lin'er (韓林兒) was proclaimed by Liu Futong (劉福通) to be the Emperor of Great Song (大宋, a reference to the extinct Song Empire) with the era name Longfeng (龍鳳 "Dragon and fenghuang").
The era name Wadō (和銅, meaning "Japanese copper") was proclaimed in recognition of this welcome event in the initial months of Empress Gemmei's reign.
Traditional historians treat his emperor status ambiguously—and sometimes he would be referred to as an emperor (with reference to his era name—thus, the Gengshi Emperor) and sometimes he would be referred to by his posthumous title, Prince of Huaiyang.
Early in the Zhenyuan era (785-805) of Emperor Daizong's son Emperor Dezong, Quan served on the staff of Li Jian (李兼) the governor (觀察使, Guanchashi) of Jiangxi Circuit (江西, headquartered in modern Nanchang, Jiangxi).
The new era name was drawn from an aphorism attributed to the ancient Chinese emperor, Great Shun (大舜): "Shun reads the Heavens, and so brings together all seven governments" (舜察天文、斉七政).