According to Nihonshoki (Chronicles of Japan), because the people were extremely unhappy about the moving of the capital, there were fire breakouts regardless of day or night (It is presumed that there was such a custom at that time that they set fire to the palace when the people were unhappy about politics.)
なお、日本書紀によるとこの遷都には民衆から大きな不満があり、昼夜を問わず出火があったという（当時は政治に不満がある時、宮殿へ放火する風習があったと推測されている）。