was a after Tenpō and before Kaei. This period spanned the years from December 1844 through February 1848. The reigning emperors were and .
was a after Tenpō and before Kaei. This period spanned the years from December 1844 through February 1848. The reigning emperors were and .
==Change of era== December 2, 1844 (): The new era name of Kōka, meaning "Becoming Wide or Vast", was created to mark a fire at Edo Castle in Tenpō 15.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).