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 of Japan
There have been six non-imperial families who have controlled Japanese emperors: the Soga (530s–645), the Fujiwara (850s–1070), the Taira (1159-1180s), the Minamoto (and Kamakura bakufu) (1192–1333), the Ashikaga (1336–1565), and the Tokugawa (1603–1867). However, every shogun from the Minamoto, Ashikaga, and Tokugawa families had to be officially recognized by the Emperors, who were still the source of sovereignty, although they could not exercise their powers independently from the Shogunate.