The Gengshi Emperor (died c.November AD 25), born Liu Xuan, was an emperor of the Han dynasty that had been restored following the downfall of Wang Mang's short-lived Xin dynasty. He was also known by his courtesy name Shenggong and as the King or Prince of Huaiyang, a posthumous title bestowed upon him by Emperor Guangwu of the Eastern Han. The Gengshi Emperor was viewed as a weak and incompetent ruler, who briefly ruled over an empire willing to let him rule over them, but was unable to keep that empire together. He was eventually deposed by the Red Eyebrows and strangled a few months after his defeat.
Traditionally, historians treated his emperor status ambiguously: sometimes he would be referred to as the Gengshi Emperor, and sometimes by his posthumous title, Prince of Huaiyang. The regime of the Gengshi Emperor is known in historiography as the Xuan Han (玄漢), after his personal name Liu Xuan.
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