《资治通鉴·唐纪·唐纪五十九》
长庆四年春季，正月，辛亥朔，唐穆宗自即位以来，首次亲临在含元殿举行的大朝会。
长庆四年甲辰，公元八二四年春，正月，辛亥朔，上始御含元殿朝会。
In spring of the fourth year of Changqing -- January, Xinhai, first day of the month: It was the first time since Tang Muzong took office he presided over the Grand Court Assembly held in Hanyuan Palace.