The current Emperor of Japan is Akihito.
He was born in 1933 and ascended to the throne in 1989.
He isn’t referred to as Akihito but with his title “His Imperial Majesty the Emperor” Tenno Heika /天皇陛下.
Japan also counts its years by Era and the Era is decided by the current Emperor.
So in 1989 the Heisei/平成 era started.
When Emperor Akihito dies he will be renamed Emperor Heisei.
He is a published author in the zoological study of fish, ichthyology.
And his birthday, December 23rd, is a national holiday.