| − | Prince Hirohito became heir apparent upon the death of his grandfather, Emperor Meiji, on 30 July 1912. At the same time his father became the 123<sup>rd</sup> Emperor, Taishō Tennō (大正天皇), thus ushering in the Taishō (大正) era. Prince Hirohito was invested as Crown Prince on 2 November 1916. He was appointed as Regent of Japan on 29 November 1921, ruling in place of his father, who was suffering from a debilitating mental illness, as a result of childhood meningitis and rumoured lead poisoning. | + | Prince Hirohito became heir apparent upon the death of his grandfather, Emperor Meiji, on 30 July 1912. At the same time his father became the 123<sup>rd</sup> Emperor, Taishō Tennō (大正天皇), thus ushering in the Taishō (大正) era. Prince Hirohito was invested as Crown Prince (''Kōtaishi'' 皇太子) on 2 November 1916. He was appointed as Regent of Japan on 29 November 1921, ruling in place of his father, who was suffering from a debilitating mental illness, as a result of childhood meningitis and rumoured lead poisoning. |