Emperor of Japan
The current Emperor on the throne is typically referred to as "Tennō Heika" (, "His (Imperial) Majesty the Emperor"), "Kinjō Heika" (, "His Current Majesty") or simply "Tennō", when speaking Japanese. The current Emperor will be renamed "Daijō Tennō" (, Retired Emperor), often shortened to "Jōkō" (), upon his planned retirement on 30 April 2019, and renamed "Heisei Tennō" () after his death and will then be referred to exclusively by that name in Japanese. In Japanese culture, it is considered a major faux pas to refer to a living Emperor by his posthumous name, although the posthumous name is the same as the era, which is used in official documents.
Christianity in Japan
It is estimated that the Japanese Orthodox Church has some 30,000 adherents today. The current primate of Japan is Daniel Nushiro, Metropolitan of all Japan and Archbishop of Tokyo, who was elevated to the primacy in 2000. The primate's seat is the Holy Resurrection Cathedral in Chiyoda, Tokyo. Founded in 1891, the cathedral has been known as Nikolai-do in honor of its founder Nicholas Kasatkin, now venerated as St. Nicholas of Japan. The cathedral serves as the seat of the national primate of Japan and continues to be the main center of Orthodox Christian worship in Japan.