Empress Lü Zhi
Liu Bang was proclaimed Emperor Gaozu of the Han Dynasty in 202 BCE. Princess Yuan's mother Empress Lü Zhi had little power after her husband became emperor and was powerless to prevent Emperor Gaozu from making plans to marry Princess Yuan, as the daughter of the legitimate wife, to a Xiongnu leader to prevent the nomads from causing trouble on the northern border. She was married later, however, to Zhang Ao of Zhao, who succeeded his father as ruler in 204 BCE. The exact date of their marriage is unknown. Their daughter Zhang Yan was married to Princess Yuan's younger brother Liu Ying in 191 BCE, as part of their mother's attempts to control the imperial household.