In 'Nichinichiki' of Harutoyo KAJUJI, there is a description which hints that there was a plot (discussion) 'to overthrow Nobunaga' between Mitsuhide and persons form the Imperial Court as follows:June 17 (old calendar) FineIn early morning, Kuranosuke SAITO, who belonged to the Akechi clan and discussed about overthrowing Nobunaga, was caught and paraded through Kyoto.
なお、勧修寺晴豊の「日々記」では、天正十年夏記において、　六月十七日　天晴。早天ﾆ済藤蔵助ﾄ申者明智者也。武者なる者也。かれなと信長打談合衆也。いけとられ車にて京中わたり申候。と光秀と朝廷側の人間が「信長ヲ打ツ」謀議（談合）を持っていたことと伺わせる記述がある。