context: Su Dingfang was born in Wuyi (now Hengshui, Hebei) in 591, during the reign of Emperor Wen of Sui. During the reign of Emperor Yang of Sui (son of Emperor Wen) a peasant uprising erupted everywhere against the tyrannical emperor's style of government. His father, Su Yong, led the local militia against the rebels. Su, who was a teenager often fought with his father in the front lines of the battle. After the death of his father, Su took over the leadership of the militia and continued his father's struggle against the rebels. According to the Tang Book he succeeded in killing rebel general Zhang Jincheng (although there is a contradiction about this, because according to the Sui Book, Zhang was killed by General Yang Yichen of Sui, while Zizhi Tongjian by Sima Guang, historian of the Song Dynasty, noted that Zhang's killer was General Yang Shanhui of Sui) and defeated another general, Yang Gongqing.
question: Where was Su Dingfang born?
answers.text: Hengshui, Hebei