Mutsuhito , posthumously honored as Emperor Meiji , was the 122nd emperor of Japan, according to the traditional order of succession. Reigning from 1867 to his death, he was the first monarch of the Empire of Japan and presided over the Meiji era. His reign is associated with the Meiji Restoration, a series of rapid changes that witnessed Japan's transformation from an isolationist, feudal state to an industrialized world power.

The emperor of Japan or Tennō , literally "ruler from heaven" or "heavenly sovereign", is the hereditary monarch and head of state of Japan. The emperor is defined by the Constitution of Japan as the symbol of the Japanese state and the unity of the Japanese people, his position deriving from "the will of the people with whom resides sovereign power". The Imperial Household Law governs the line of imperial succession. Pursuant to his constitutional role as a national symbol, and in accordance with rulings by the Supreme Court of Japan, the emperor is personally immune from prosecution. By virtue of his position as the head of the Imperial House, the emperor is also recognized as the head of the Shinto religion, which holds him to be the direct descendant of the sun goddess Amaterasu. According to tradition, the office of emperor was created in the 7th century BC, but the first historically verifiable emperors appear around the 5th or 6th centuries AD.