The warlord Li Zhengji submitted a petition stating that Liu had been innocently killed and requested that his family be allowed to return to Chang'an -- a petition that Emperor Dezong ignored .
Li Zhengji had been looking for excuses to complain about imperial governance .
The warlord Li Zhengji , who had been looking for excuses to complain about imperial governance , submitted a petition stating that Liu had been innocently killed and requested that his family be allowed to return to Chang'an -- a petition that Emperor Dezong ignored .