According to the traditional account of the Nihon Shoki, Japan was founded by Emperor Jimmu in 660 BC. Modern historians agree that the Emperors before the possible late 3rd century AD ruler known traditionally as Emperor Ōjin are legendary. Emperor Ankō of the 5th century AD, traditionally the 20th emperor, is the earliest generally agreed upon historical ruler of all or a part of Japan. The reign of Emperor Kinmei (c. 509 -- 571 AD), the 29th emperor, is the first for which contemporary historiography is able to assign verifiable dates; however, the conventionally accepted names and dates of the early emperors were not to be confirmed as "traditional '' until the reign of Emperor Kanmu (737 -- 806), the 50th sovereign of the Yamato dynasty.
who were the first family to be recognized as emperors of japan
Yamato dynasty