熱田神宮
Although the sword is mentioned in the , this book is a collection of Japanese myths and is not considered a historical document. The first reliable historical mention of the sword is in the . Although the also contains mythological stories that are not considered reliable history, it records some events that were contemporary or nearly contemporary to its writing, and these sections of the book are considered historical. In the , the Kusanagi was removed from the Imperial palace in 688, and moved to Atsuta Shrine after the sword was blamed for causing Emperor Tenmu to fall ill. Along with the jewel () and the mirror (), it is one of the three Imperial Regalia of Japan, the sword representing the virtue of valor.