 Emperor Xiaowu had engaged in incestuous relationships with three of his cousins, at least one of whom, Yuan Mingyue (元明月) the Princess Pingyuan, followed him to Chang'an.Yuwen disapproved of the relationship, and he persuaded the imperial princes to arrest Yuan Mingyue and put her to death.Emperor Xiaowu became angry, and he often showed his displeasure by tightening his bow or by pounding his table in the palace.