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.
Emperor of Japan
The role of the Emperor of Japan has historically alternated between a largely ceremonial symbolic role and that of an actual imperial ruler. Since the establishment of the first shogunate in 1199, the Emperors of Japan have rarely taken on a role as supreme battlefield commander, unlike many Western monarchs. Japanese Emperors have nearly always been controlled by external political forces, to varying degrees. In fact, between 1192 and 1867, the "shōguns", or their "shikken" regents in Kamakura (1203–1333), were the "de facto" rulers of Japan, although they were nominally appointed by the Emperor. After the Meiji Restoration in 1867, the Emperor was the embodiment of all sovereign power in the realm, as enshrined in the Meiji Constitution of 1889. Since the enactment of the 1947 Constitution, he has been a ceremonial head of state without even nominal political powers.