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.
Prince Kuni Asahiko
Three of Prince Asahiko's sons, Prince Kaya Kuninori, Prince Kuni Taka, and Prince Nashimoto Morimasa, successively served as lord custodian priests of the Ise Shrine between 1891 and 1947. Prince Asahiko's son Prince Kuni Kuniyoshi was the father of Princess Nagako of Kuni, who married the future Emperor Shōwa and became the mother of the present Japanese emperor.