ぼつご
after death; posthumously
Common word Also written 歿後
Noun, Adverb
1989年ねん1月つき昭和天皇しょうわてんのうの没後ぼつご、年号ねんごうが「平成へいせい」と改あらたまりました。
The emperor passed away in January of 1989. Therefore, the name of the era changed from Showa to Heisei.