How many Japanese Emperors have ever opened the Olympic Games?

How many Japanese Emperors have ever opened the Olympic Games?

Japan’s Emperor Naruhito made the opening declaration of the 2020 Olympic Games, Friday, July 23, 2021. He was the third Japanese Emperor to open an Olympics, following his grandfather Emperor Hirohito (1964 Summer and 1972 Winter Olympics) and his father Emperor Akihito (1998 Winter Olympics).