It was a after Tenp? and before Kaei. This period spanned the years from 1844 through 1848. The reigning emperors were and . Change of era ; December 2, 1844: The new era name of K?ka, (meaning "Becoming Wide or Vast") was created to mark a fire at Edo Castle in Tenp? 15. Events of the K?ka era K?ka gannen (1844
Source: http://www.sonorika.co.uk/koka
