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TOKYO, JAPAN - NOVEMBER 30: Prince Akishino (2nd L), second son of Crown Prince Akihito (1st L) and Crown Princess Michiko(1st R), celebrates his fourth birthday with Prince Naruhito (C) and Princess Nori (aka Princess Sayako, 2nd R) at Togu Palace on November 30, 1969 in Tokyo, Japan. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

TOKYO, JAPAN - NOVEMBER 30: Prince Akishino (2nd L), second son of Crown Prince Akihito (1st L) and Crown Princess Michiko(1st R), celebrates his fourth birthday with Prince Naruhito (C) and Princess Nori (aka Princess Sayako, 2nd R) at Togu Palace on November 30, 1969 in Tokyo, Japan. (Photo by Keystone-France/Gamma-Keystone via Getty Images)