While the conflict between the two Imperial Courts existing at the same time was getting deeper and deeper, the Retired Emperor Heizei gave an imperial edict about discontinuing the Heian-kyo capital and moving the capital back to Heijo-kyo on September 6 (according to the old calendar).
二所朝廷の対立が深まる中で、9月6日(旧暦)、平城上皇は平安京を廃して平城京へ遷都する詔勅を出した。