Kōka
Period of Japanese history (1844–1848)
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Change of era
- December 2, 1844 (Kōka gannen (弘化元年)): The new era name of Kōka, meaning "Becoming Wide or Vast", was created to mark a fire at Edo Castle in Tenpō 15.
The nengo was not changed concurrent with the accession of Emperor Komei; instead, the Kōka era was retained until about a year after the new emperor was enthroned.[2]