was a after Ryakunin and before Ninji. This period spanned the years from February 1239 to July 1240. The reigning emperor was .
was a after Ryakunin and before Ninji. This period spanned the years from February 1239 to July 1240. The reigning emperor was .
==Change of era== 1239 : The era name was changed to mark an event or a number of events. The previous era ended and a new one commenced in Ryakunin 2.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).