and demanded Jiu and his supporters be handed over. To appease Duke Huan, Duke Zhuang then executed the rogue prince and delivered Guan Zhong to Qi as a prisoner. Reign Rise to hegemon Though he was now secure on the throne, the question that remained for Duke Huan was what to do with Guan Zhong who had so prominently supported his rival brother. Bao Shuya asked his newly crowned ruler to not just spare Guan Zhong, but to even employ him as chief minister due to his great talents. Duke Huan followed this advice, and Guan Zhong became his most important and capable advisor. The two went on to reorganize Qi's government and society, dividing both the land as well as the people into regulated units and enforcing a meritocratic system of governance. This greatly strengthened Qi, as it allowed the state to "mobilize human and material resources more effectively than other Zhou states, which remained loosely structured." As Qi had already been a powerful polity in a favorable strategic situation before, these reforms managed to bring Qi to "an unprecedented status of leadership in the entire Zhou world". Together, Duke Huan and Guan Zhong worked toward achieving dominance over the other Zhou states, and as time went on ever more of them became followers of Qi. Hegemony Eventually Duke Huan invited the rulers of Lu, Song, Chen, and Zheng to a conference in 667 BC, where they elected him as their leader. After hearing of this, King Hui of Zhou appointed Duke Huan hegemon (ba) with the authority to operate militarily in the name of the royal court. Duke Huan and Guan Zhong envisioned the office of "hegemon" not just as mere position of military power, but rather as one that was supposed to "restore the authority of the Son of Heaven" or, more practically, restabilize the old realm of the Zhou dynasty under the leadership of Qi. Consequently, Duke Huan intervened in matters that concerned the interstate relationships of the Zhou polities, both on behalf of King Hui as well as to assert his own position as hegemon. Such interventions included a punitive expedition against Wey in 671 BC, because this state had defied King Hui, as well as involvement in a power struggle in Lu in order to cement Qi's power. Another major concern for Duke Huan was the threat that outside powers (derogatorily called the "Four