The Japanese imperial lineage is the oldest continuing hereditary monarchy in the world, tracing its origins back over 1,400 years. It is traditionally believed to have been founded by Emperor Jimmu, who is said to have ascended to the throne in 660 BCE. The lineage is characterized by a succession of emperors, with the current emperor being Naruhito, who ascended the throne in 2019. The Japanese imperial family is considered a symbol of the nation and its unity, rather than a governing authority. The emperor's role is largely ceremonial, with the constitution defining the emperor as "the symbol of the State and of the unity of the people." The imperial family participates in various cultural and religious ceremonies, maintaining traditions that have been passed down through generations.