In the former case, Nihonshoki has it that the curse was placed because the Ama no Murakumo no Tsurugi Sword stolen from Atsuta-jingu Shrine and lost was presented to the Imperial Court and stored there.
前者は熱田神宮から盗まれた行方不明だった天叢雲剣が献上され宮中にとどめおいたため祟ったとある。