But Satoyasu attracted Hachiemon to Aizu Wakamatsujo Castle (according to an opinion, it was the palace of the Gamo clan in Kyoto) and assassinated him on the pretext of 'kill of offender.'
ところが郷安は事もあろうに、八右衛門を会津若松城（一説に、蒲生氏の京都屋敷）に誘き寄せて上意討ちとして斬殺してしまったのである。