1) Japanese era 
==Change of era== The era name is derived from an aphorism in the Book of Song: `A wise Emperor receives much help, One who esteems comfort is on the outside` (思皇享多祐、嘉楽永無央). ==Events of the Kaei Era== ==Gallery== File:Kaei period Edasen.jpg|Branched (`Edasen` 枝錢) Mon coins of Tokugawa coinage, of the Kaei period. ...