Shishinden was the state chamber of Dai-dairi (place of the Imperial Palace and government offices) in Heian-kyo and a place held Choga (the national ceremony in which Emperor received New Year's congratulations from the whole body of officials) and public matters as well as imperial or state ceremonies held later.
紫宸殿は、平安京の大内裏の正殿で、朝賀・公事を行なう所で、のち大礼も行なわれた。