Government of Japan
The Current Emperor of Japan (今上天皇) is Akihito. He was officially enthroned on November 12, 1990. He is styled as "His Imperial Majesty" (天皇陛下), and his reign bears the era name of Heisei (平成). Naruhito, the Crown Prince of Japan, is the heir apparent to the Chrysanthemum Throne.
Emperor Kinmei
His reign is said to have spanned the years from 539 through 571. Kinmei is the first Japanese emperor for whom contemporary historiography is able to assign verifiable dates.