The Chotoku Coup, occurred after FUJIWARA no Michinaga received Nairan no senji (an imperial edict to appoint a person to the position of Nairan, who has a right to read and deal with documents before reporting to the Emperor from Daijokan, the Great Council of State), after the death of FUJIWARA no Michitaka on May 17, 995.
長徳の変（ちょうとくのへん）とは長徳元年（995年）4月10日(旧暦)の藤原道隆の死後、藤原道長が内覧の宣旨を得た後に起きた政変。