還かん啓けい

Meanings

return to the palace

archaic

Archaic term for the return of a high-ranking imperial person (empress, crown prince, etc.) to the palace. Not used in modern Japanese outside historical contexts.

古こ文もん書じょには、皇こう后ごうの還かん啓けいが記しるされている。
The ancient document records the empress's return to the palace.