Li Yuanji
It was said that, while he was at Taiyuan, Li Yuanji was arrogant and wasteful, and he often held military exercises with his concubines and servants, involving use of actual armor and arms, and they suffered many casualties in these exercises, including injuries to Li Yuanji himself. His wet nurse Chen Shanyi (陳善意) tried to get him to change his ways, but he had his guards batter her to death. In spring 619, when his assistant Yuwen Xin (宇文歆) reported this to Emperor Gaozu, Emperor Gaozu temporarily removed him from his post. Less than a month later, however, with the people of Taiyuan petitioning to have Li Yuanji kept in charge, Emperor Gaozu restored him. (The traditional historians allege that Li Yuanji pressured the people into petitioning Emperor Gaozu.)