建けん永えいけんえいMeanings1nounKen'ei era (1206.4.27–1207.10.25)Japanese era name (年号) of the early Kamakura period, spanning about one and a half years.建けん永えいは、鎌かま倉くら時じ代だいの元げん号ごうの一ひとつです。Ken'ei is one of the era names of the Kamakura period.