Deity of the Storms. Ruler of the Sea. The youngest sibling of Amaterasu and Tsukuyomi, third of the "three noble children". He was born when his father, Izanagi-no-Mikoto cleansed himself of the taint of the underworld after he visited his undead wife, Izanami-no-Mikoto, and narrowly escaped her enraged clutches. Susano'o was born when Izanagi washed out his mouth.
Susano'o and Amaterasu had a contentious relationship. He once insulted his sister that she had no power over the higher realm and challenged her ability. Susano'o promptly lost to Amaterasu. He threw a tantrum, destroying Amaterasu's heavenly and earthly realms, including her prized rice fields, and murdered one of her beloved attendants. This rampage disgusted Amaterasu, and she went into hiding in the "heavenly rock cave (Awa-No-Iwato)" to tend to her grief and fury.
As a result, the world fell into darkness and chaos. Amaterasu emerged out from the cave only after a banquet was held in her honor and the Goddess Ame-no-Uzume performed a ritual dance. After this incident, Susano'o was banned from the heavens. The two siblings eventually amended their conflict, and as a token of their reconciliation, Susano'oo gifted Amaterasu his prized sword, Kusanagi-no-Tsurugi.