Emperor Ōjin is a legendary figure in Japanese history, traditionally regarded as the 15th emperor of Japan. He is often associated with the 3rd century and is considered a semi-mythical ruler. His reign is noted for the introduction of military advancements and the establishment of a more organized state. Ōjin is also linked to the Hachiman deity, the god of war, and is often depicted as a protector of the Japanese people. His legacy includes the promotion of Shinto practices and the development of early Japanese culture, making him an important figure in the nation's historical narrative.