The genealogy of the Emperor's family is made based on history books including the 'Kojiki' (A Record of Ancient Matters) and 'Ninhonshoki' (Chronicles of Japan), and the origin is regarded as Emperor Jinmu, who was enthroned in 660 B.C., and furthermore gods such as Kuninotokotachi who are the progenitor of the Emperors.
天皇家の系図は、『古事記』・『日本書紀』を初めとする史書に基づいて作られ、その起源は紀元前660年に即位した神武天皇、さらにはその始祖であるクニノトコタチなどの神々に始まるとされている。