Glossary

Eiso

永祚

Term · calendar

Japanese era name (永祚) for the years 989–990: 989 is Eiso 1 (元年) and Eiso 2 is 990. Eiso (永祚) is a Japanese era name (nengō), proclaimed in 989. Its years are counted in lunar years from the new year before the proclamation: 989 is Eiso 1 (元年), 990 its last year, Eiso 2. A Japanese source dates a year within it as “Eiso 2” (永祚2年) rather than by a continuous count. Before: Eien. After: Shōryaku.