Kusanagi-no-Tsurugi is a legendary Japanese sword and one of three Imperial Regalia of Japan. It was originally called Ame-no-Murakumo-no-Tsurugi , but its name was later changed to the more popular Kusanagi-no-Tsurugi. In folklore, the sword represents the virtue of valor.

The Three Sacred Treasures are the imperial regalia of Japan and consist of the sword Kusanagi no Tsurugi (草薙劍), the mirror Yata no Kagami (八咫鏡), and the jewel Yasakani no Magatama (八尺瓊勾玉). They represent the three primary virtues: valour, wisdom, and benevolence. The actual historical status of these legendary treasures is unknown as they are intentionally kept from public view to symbolize authority.