《宋书·志·卷十八》
诸王子继位为王，其婚葬吉凶礼仪，一律依照诸国公侯标准，不得比同皇弟皇子。
诸王子继体为王者，婚姻吉凶，悉依诸国公侯之礼，不得同皇弟皇子。
When a prince inherits the throne and becomes king, the rituals for his wedding, funeral, good fortune, and misfortune must all be equal to the standards for the great dukes and marquesses of various nations, they must not be the same as those for the emperor's younger brothers or sons.