Princes Charles, Philippine president Rodrigo Duterte, former French president Nicolas Sarkozy and Brazilian leader Jair Bolsonaro are all in Tokyo this week, as foreign figureheads and royals from across the globe flock to Japan to watch Emperor Naruhito formally declare his enthronement on Tuesday. The former Crown Prince took over the role on May 1, the day after his father, 85-year-old former-Emperor Akihito, abdicated the throne citing health concerns.