The first Japanese ruler was jimmu.
because of the foreign influences.
日本 (Nihon)
日本 "Nihon" (nee-hohn) with emphasis on the "hon", sometimes it can be read "nippon".
Prime Minister Fukuda just reigned, so there is no single ruler. The emperor is only a figurehead, and has no real political power at all. This system is called a constitutional monarchy and is...