Duke Huan of Qi (; died 643 BC), personal name Xiǎobái (小白), was the ruler of the State of Qi from 685 to 643 BC. Living during the chaotic Spring and Autumn period, as the Zhou dynasty's former vassal states fought each other for supremacy, Duke Huan and his long-time advisor Guan Zhong managed to transform Qi into China's most powerful polity. Duke Huan was eventually recognized by most of the Zhou states as well as the Zhou royal family as Hegemon of China. In this position, he fought off invasions of China by non-Zhou peoples and attempted to restore order throughout the lands. Toward the end of his more than forty-year-long reign, however, Duke Huan's power began to decline as he grew ill and Qi came to be embroiled in factional strife. Following his death in 643 BC, Qi completely lost its predominance. Early life and rise to power Xiǎobái was born as one of Duke Xi of Qi's sons, though not in line of succession for the throne as he had at least two older brothers: Zhu'er and Jiu. In his youth, Xiǎobái was tutored by Bao Shuya. When Duke Xi eventually died, Zhu'er became Qi's next ruler as "Duke Xiang" but his reign was fraught with internal conflicts and scandals. Recognizing this and fearing for his pupil's life, Bao Shuya took Xiǎobái and fled with him to the state of Ju where they went on to live in exile. Duke Xiang was assassinated in 686 BC, which allowed his cousin, Wuzhi, to ascend the throne. After just one month in office, however, Wuzhi was also murdered. With these two dead, Xiǎobái returned to Qi with the goal of becoming the next duke. He faced opposition in the form of his older brother Jiu however. Prince Jiu, by then also in exile, managed to gain the support of several high-ranking officials in Qi, his tutor Guan Zhong and Duke Zhuang of Lu. Before Jiu could be installed as new duke of Qi, however, Xiǎobái managed to seize control of Qi's government as well as its army, and was crowned as "Duke Huan of Qi" in 685 BC. The army of Lu under Duke Zhuang promptly invaded in order to install Prince Jiu on the throne, but the invading force suffered a crushing defeat at Qianshi and had to retreat. Qi's army under Bao Shuya in turn invaded Lu,