Emperor Naruhito attends a ceremony to proclaim his enthronement to the world, called Sokuirei-Seiden-no-gi, at the Imperial Palace in Tokyo, Japan October 22, 2019.

Video. Watch: Japanese emperor ascends to throne in centuries-old ceremony

Japanese Emperor Naruhito formally proclaimed his ascendancy to the throne on Tuesday in a centuries-old ceremony attended by dignitaries from more than 180 countries, pledging to fulfil his duty as a symbol of the state.

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