First tenure as the commander of the armed forces
After Wang Mang was promoted to this position—effectively the highest in the imperial government—he became even better known for his self-discipline and promotion of capable individuals than before. As a result, the people's perception of the Wang clan as arrogant, wasteful, and petty, began to be reversed.
In 7 BC, Wang's cousin Emperor Cheng died suddenly, apparently from a stroke (although historians also report the possibility of an overdosage of aphrodisiacs given to him by his favorite, Consort Zhao Hede). Emperor Cheng's nephew Crown Prince Liu Xin (劉欣) (the son of his brother
Prince Kang of Dingtao (劉康)) became emperor (as Emperor Ai). For the time being, Wang remained in his post and continued to be powerful, as his aunt became grand empress dowager and was influential.
However, that would soon change. Emperor Ai's grandmother, Princess Dowager Fu of Dingtao (concubine of Grand Empress Dowager Wang's husband Emperor Yuan) was a domineering woman who ruled her grandson. She greatly wanted the title of empress dowager as well. Initially, Grand Empress Dowager Wang decreed that Princess Dowager Fu and Emperor Ai's mother
Consort Ding see him periodically, every 10 days. However, Princess Dowager Fu quickly began to visit her grandson every day, and she insisted that two things be done: that she receive an empress dowager title, and that her relatives be granted titles, like the Wangs. Grand Empress Dowager Wang, sympathetic of the bind that Emperor Ai was in, first granted Prince Kang the unusual title of "Emperor Gong of Dingtao" (定陶共皇) and then, under the rationale of that title, granted Princess Dowager Fu the title "Empress Dowager Gong of Dingtao" (定陶共皇太后) and Consort Ding the title "Empress Gong of Dingtao" (定陶共皇后). Several members of the Fu and Ding clans were created marquesses. Grand Empress Dowager Wang also ordered Wang Mang to resign and transfer power to the Fu and Ding relatives. Emperor Ai declined and begged Wang Mang to stay in his administration.
Several months later, however, Wang Mang came into direct confrontation with now-Empress Dowager Fu. At a major imperial banquet, the official in charge of seating placed Empress Dowager Fu's seat next to Grand Empress Dowager Wang's. When Wang Mang saw this, he rebuked the official and ordered that Empress Dowager Fu's seat be moved to the side, which drew great ire from Empress Dowager Fu, who then refused to attend the banquet. To soothe her anger, Wang Mang resigned, and Emperor Ai approved his resignation. After this event, the Wangs gradually and inexorably began to lose their power.