The Nara period (710–784) marked the emergence of a Japanese state centered on the Imperial Court in Heijō-kyō (modern Nara). The period is characterized by the appearance of a nascent literary culture with the completion of the ''Kojiki'' (712) and ''Nihon Shoki'' (720), as well as the development of Buddhist-inspired artwork and architecture. A smallpox epidemic in 735–737 is believed to have killed as much as one-third of Japan's population. In 784, Emperor Kanmu moved the capital, settling on Heian-kyō (modern Kyoto) in 794. This marked the beginning of the Heian period (794–1185), during which a distinctly indigenous Japanese culture emerged. Murasaki Shikibu's ''The Tale of Genji'' and the lyrics of Japan's national anthem "Kimigayo" were written during this time.