In the same year, based on a complaint submitted by MINAMOTO no Mamoru, Masakado and TAIRA no Maki received a summons from the Imperial Court, and Masakado went to Heian-kyo (Kyoto), where he was interrogated at the Kebiishicho (Office of Police and Judicial Chief), but he was pardoned of all crimes because of an amnesty granted on May 24, 937, at the occassion of Emperor Suzaku's genpuku (celebrate one's coming of age).
同年、源護によって出された告状によって朝廷から将門と平真樹に対する召喚命令が出て、将門らは平安京に赴いて検非違使庁で訊問を受けるが、承平7年（937年）4月7日の朱雀天皇元服の大赦によって全ての罪を赦される。