Records of heads of state
Officially, the current Emperor of Japan, Akihito is the 125th in line from the first emperor Jimmu, who is variously believed to have reigned in the 1st or 7th century BC. The earliest documentary evidence is only for the 29th emperor, Kinmei (AD 509–571); however, this is sufficient such that even the most conservative of estimates still places the Japanese imperial family as among the oldest lines in the world today.
Controversies regarding the role of the Emperor of Japan
In the Meiji Constitution of 1889, the emperor was sovereign and was the focus of the state's legitimacy. The preamble stated, "The rights of sovereignty of the State, We have inherited from Our Ancestors, and We shall bequeath them to Our descendants." In the postwar constitution, the emperor's role in the political system was drastically redefined. A prior and important step in this process was Emperor Hirohito's 1946 New Year's speech, made at the prompting of General Douglas MacArthur, renouncing his status as a divine ruler, without however repudiating that he was a descendant of Amaterasu as arahitogami. Hirohito declared that relations between the ruler and his people cannot be based on "the false conception that the emperor is divinity in human form ("akitsumikami") or that the Japanese people are superior to other races."