Akihito was born in 1933, just as Japan was embarking on its militaristic sweep across Asia. He was enthroned in 1989 after the death of his father Emperor Hirohito.

Akihito is credited with seeking reconciliation at home and abroad over the legacy of the war fought in his father's name.

Last year, Akihito expressed "deep remorse" for Japan's actions in World War II. His words were interpreted by some as a rebuke to nationalist Prime Minister Shinzo Abe, who has pushed to change Japan's pacifist constitution.