A vendetta is the wreaking of vengeance upon a man’s murderer by his relations, friends, or retainers. It took place not only when the murderer killed his victim with his own hand, but also when he incited another to the act, or even when one struck and killed a man without intent to murder. Strictly-speaking, it was of course the duty of the state to punish a murder and not to leave it to private vengeance; a vendetta was, in fact, an act done in defiance of the punitive right of the state and subversive of the social order. In the Yedo period, society was, it is true, kept in strict order, and the relations between lord and retainer and between father and child were rigorously observed; but it was also a period in which an intimate connection subsisted between morality and law, and the vendetta was recognised as an unavoidable act originating in the intense feelings of loyalty and filial piety. It was permitted on moral grounds as the result of the teachings of Bushido and Confucianism. It may here be added that although the vendetta of the Ako retainers was a subject of discussion among contemporary and later scholars, the question turned upon whether the retainers were justified in looking upon Kira Yoshinaka as their true enemy; no doubt was ever expressed upon the legitimacy of vendetta itself. The formal procedure for carrying out a vendetta in the Tokugawa period was first for the avenger to apply for permission, if he lived in Kyoto, to the deputy-governor, if in Yedo, to the city magistrate, and if in the provinces, to the local lord; and these reported it to the central government, which then entered it in the official register and gave the required permission. Now, the murderer seldom remained quietly in the locality where the act was committed, but almost invariably fled to other territories; and therefore it was probable that if the avenger killed him as he always did regardless of time or place immediately he discovered him, he would cause a disturbance there and might be brought to account for it. If, however, his vendetta was entered in the official register, he was permitted to kill his enemy anywhere. In such case, the local officials came as soon as they heard that a vendetta had taken place, and if they were satisfied that it had been officially registered, they took no further note of the matter. However, even when it had not been registered, they usually let the avenger go if it was shown that he had not been actuated by malice, but had done the deed from loyalty or filial piety.