釋氏稽古略 3.156

3.156

In the xinchou year, the eighth month of the second year of Shangyuan, it was decreed that the reign era name be removed and it simply be called the "First Year"; imperial honorific titles were eliminated, simply styling [the monarch] "Emperor"; the month of jianzi was made the beginning of the year, and months were all numbered by their astrological branch (chen). The next year things were restored as before. Shi Siming loved his younger son Chaoqing and installed him as crown prince, wishing to kill his eldest son Chaoyi. Chaoyi's subordinate general Luo Yue imprisoned Shi Siming and killed him. Chaoyi assumed the imperial throne.