Oshikuma-no-Oji dwas born in japan. He was a son of Emperor Chuai. His mother was Onaka-tsu-hime.
When Empress Jingu returned from an expedition in Korea, he and his elder brother, Prince Kagosaka, attacked her forces when they were about to land on Japanese soil. He retreated to Uji, near Kyoto, upon the death of his brother, and was defeated at Osaka. He and his followers killed themselves by drowning in the Seta River.