In February, 408 B.C., he was formally installed as Crown Prince, and after the death of his father in 393 B.C., he ascended the throne on next New Year's Day.
孝昭天皇68年正月（紀元前408年）に立太子し、同83年（紀元前393年）父天皇の崩御に伴い、翌年正月に即位した。