his sons Yuan Tan and Yuan Shang became embroiled in internecine struggles over their father's vast domain. When the Yuan brothers were exhausted from their wars against each other, Cao Cao attacked and defeated them, swiftly conquering the territories that used to be controlled by the Yuans. In September or October 204, Cao Cao defeated Yuan Shang at the Battle of Ye and his forces occupied the city. Cao Cao's son, Cao Pi, entered Yuan Shao's residence and met Lady Liu (Yuan Shao's widow) and Lady Zhen. Lady Zhen was so terrified that she buried her face in her mother-in-law's lap. Cao Pi said, "What's going on, Madam Liu? Ask that lady to lift up her head!" Cao Pi was very impressed and entranced by Lady Zhen's beauty when he saw her. His father allowed him to marry her later. Another account of this incident stated that Lady Liu and Lady Zhen were in Yuan Shang's residence when Cao Pi entered. Lady Zhen's hair was dishevelled and she was crying behind her mother-in-law. When Cao Pi asked, Lady Liu told him the woman behind her was Yuan Xi's wife. Cao Pi was so entranced by Lady Zhen's beauty that he married her and treated her well. Yuan Xi was still alive at the time. Yuan Shang came to join him after his defeat by Cao Cao. In 207, Cao Cao defeated Yuan Xi, Yuan Shang and their Wuhuan allies at the Battle of White Wolf Mountain, after which they fled to Liaodong to join the warlord Gongsun Kang. Gongsun Kang feared that they would become a threat to him, so he lured them into a trap, executed them, and sent their heads to Cao Cao. As Cao Pi's wife Lady Zhen bore Cao Pi a son and a daughter. Their son, Cao Rui, later became the second emperor of the state of Cao Wei in the Three Kingdoms period. Their daughter, whose personal name was not recorded in history, was referred to as "Princess Dongxiang" (東鄉公主; literally "Princess of the East District") in historical records. Lady Zhen remained humble even though Cao Pi deeply fancied her. She provided encouragement to Cao Pi's other wives who were also adored by him, and comforted those whom he less favoured. She also often urged Cao Pi to take more concubines so that he would have more descendants, citing the example of the mythical