Emperor Sujin
Modern historians generally believe that the emperors up to Suinin are "largely legendary" as there is insufficient material available for verification and study of their lives. Emperor Sujin (148-30 BC) is the first emperor with a direct possibility of existence according to historians, but he is referred to as "legendary" due to a lack of information. The emperors from Emperor Keiko to Emperor Ingyo (376–453 AD) are considered as perhaps factual. Emperor Ankō (401–456), traditionally the 20th emperor, is the earliest generally agreed upon historical ruler of all or a part of Japan. The reign of Emperor Kinmei (–571 AD), the 29th emperor, is the first for whom contemporary historiography is able to assign verifiable dates; however, the conventionally accepted names and dates of the early emperors were not confirmed as "traditional" until the reign of Emperor Kanmu (737–806), the 50th sovereign of the Yamato dynasty.