Gengobe is in fact Kazuemon FUWA, he had been a retainer of the Enya family; however, since goyokin (public money), which he had been overseeing, had been stolen by thieves, he was banished and became a ronin.
源五兵衛は実は不破数右衛門という元塩冶家家臣であったが、盗賊に御用金を盗まれた落度によって浪人している。