is the current , the 125th emperor of his line according to Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

's traditional order of succession. He acceded to the throne in 1989.
In Japan, the emperor is never referred to by his given name, but rather is referred to as "His Imperial Majesty the Emperor" which may be shortened to . In writing, the emperor is also referred to formally as .