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Emperor Tenmu, born Prince Oama, was the youngest son of Emperor Jomei and Empress Kogyoku. His path to the throne opened unexpectedly when his elder brother, Emperor Tenji, initially lacked a male heir. However, Tenji fathered Prince Otomo late in life, shifting Tenmu's prospects. Fearing for his safety after Tenji designated Otomo as successor, Tenmu withdrew to Yoshino in Yamato province, ostensibly to pursue a monastic life. There, he secured protection from local inhabitants and reportedly instructed them in traditional crafts such as washi paper-making and court music.

Upon Tenji's death and Otomo's ascension as Emperor Kobun, Tenmu mobilized forces from Yoshino, sparking the Jinshin War in 672. This conflict reached its climax in a decisive battle in northeastern Mino province, where Tenmu's army defeated Kobun's forces. Emperor Kobun subsequently took his own life, enabling Tenmu to claim the throne in 673.

His reign focused on consolidating imperial authority through major administrative and religious reforms. He governed jointly with his wife, Empress Jito, and a council of imperial princes, deliberately leaving the position of Great Minister vacant for fourteen years to centralize decision-making. Key initiatives included the 681 decree initiating the Asuka no Kyomihara Ritsuryō legal codes and the 684 establishment of the Yakusa no Kabane system, restructuring aristocratic ranks to reinforce imperial control.

Religiously, he reinstated the tradition of rebuilding the Ise Grand Shrine every twenty years as a symbol of renewal and imperial legitimacy. While critical of Buddhism's political influence, he permitted its propagation as a protective institution for the state and oversaw the construction of temples like Yoshinoyama's Sakuramoto-bo. He also contributed to domestic practices by inventing the household butsudan altar.

Culturally, he commissioned the compilation of historical records in 682, leading to the creation of Japan's earliest chronicles, the Kojiki and Nihon Shoki. These texts documented imperial genealogy and mythological origins, shaping historical consciousness.

He maintained ties to Yoshino, where a villa was constructed for his use; its remains were later rediscovered in Yoshino's Miyataki area. He died in 686 at approximately age 55. Empress Jito continued his governance, completing projects like Japan's first planned capital at Fujiwara-kyo in modern Kashihara City.