The conspiracy of the Pazzi against Lorenzo and Giuliano de’ Medici is well known. The scheme agreed on was to give a banquet to the Cardinal S. Giorgio, at which the brothers should be put to death. To each of the conspirators a part was assigned: to one the murder, to another the seizure of the palace, while a third was to ride through the streets and call on the people to free themselves. But it so chanced that at a time when the Pazzi, the Medici, and the Cardinal were all assembled in the cathedral church of Florence to hear High Mass, it became known that Giuliano would not be present at the banquet; whereupon the conspirators, laying their heads together, resolved to do in church what they were to have done elsewhere. This, however, deranged the whole scheme. For Giovambattista of Montesecco, would have no hand in the murder if it was to be done in a church; and the whole distribution of parts had in consequence to be changed; when, as those to whom the new parts were assigned had no time allowed them to nerve their minds to their new tasks, they managed matters so badly that they were overpowered in their attempt.

Courage fails a conspirator either from his own poorness of spirit, or from his being overcome by some feeling of reverence. For such majesty and awe attend the person of a prince, that it may well happen that he softens or dismays his executioners. When Caius Marius was taken by the people of Minturnum, the slave sent in to slay him, overawed by the bearing of the man, and by the memories which his name called up, became unnerved, and powerless to perform his office. And if this influence was exercised by one who was a prisoner, and in chains, and overwhelmed by adverse fortune, how much more must reverence be inspired by a prince who is free and uncontrolled, surrounded by his retinue and by all the pomp and splendour of his station; whose dignity confounds, and whose graciousness conciliates.

Certain persons conspiring against Sitalces, king of Thrace, fixed a day for his murder, and assembled at the place appointed, whither the king had already come. Yet none of them raised a hand to harm him, and all departed without attempting anything against him or knowing why they refrained; each blaming the others. And more than once the same folly was repeated, until the plot getting wind, they were taken and punished for what they might have done, yet durst not do.

Two brothers of Alfonso, Duke of Ferrara, conspired against him, employing as their tool a certain priest named Giennes, a singing-man in the service of the Duke. He, at their request, repeatedly brought the Duke into their company, so that they had full opportunity to make away with him. Yet neither of them ever ventured to strike the blow; till at last, their scheme being discovered, they paid the penalty of their combined cowardice and temerity. Such irresolution can only have arisen from their being overawed by the majesty of the prince, or touched by his graciousness.

In the execution of conspiracies, therefore, errors and mishaps arise from a failure of prudence or courage to which all are subject, when, losing self-control, they are led in their bewilderment to do and say what they ought not. That men are thus confounded, and thrown off their balance, could not be better shown than in the words of Titus Livius, where he describes the behaviour of Alasamenes the Etolian, at the time when he resolved on the death of Nabis the Spartan, of whom I have spoken before. For when the time to act came, and he had disclosed to his followers what they had to do, Livius represents him as “collecting his thoughts which had grown confused by dwelling on so desperate an enterprise.” For it is impossible for any one, though of the most steadfast temper and used to the sight of death and to handle deadly weapons, not to be perturbed at such a moment. For which reason we should on such occasions choose for our tools those who have had experience in similar affairs, and trust no others though reputed of the truest courage. For in these grave undertakings, no one who is without such experience, however bold and resolute, is to be trusted.

The confusion of which I speak may either cause you to drop your weapon from your hand, or to use words which will have the same results. Quintianus being commanded by Lucilla, sister of Commodus, to slay him, lay in wait for him at the entrance of the amphitheatre, and rushing upon him with a drawn dagger, cried out, “The senate sends you this;” which words caused him to be seized before his blow descended. In like manner Messer Antonio of Volterra, who as we have elsewhere seen was told off to kill Lorenzo de’ Medici, exclaimed as he approached him, “Ah traitor!” and this exclamation proved the salvation of Lorenzo and the ruin of that conspiracy.

For the reasons now given, a conspiracy against a single ruler may readily break down in its execution; but a conspiracy against two rulers is not only difficult, but so hazardous that its success is almost hopeless. For to effect like actions, at the same time, in different places, is well-nigh impossible; nor can they be effected at different times, if you would not have one counteract another. So that if conspiracy against a single ruler be imprudent and dangerous, to conspire against two, is in the last degree fool-hardy and desperate. And were it not for the respect in which I hold the historian, I could not credit as possible what Herodian relates of Plautianus, namely, that he committed to the centurion Saturninus the task of slaying single-handed both Severus and Caracalla, they dwelling in different places; for the thing is so opposed to reason that on no other authority could I be induced to accept it as true.

Certain young Athenians conspired against Diocles and Hippias, tyrants of Athens. Diocles they slew; but Hippias, making his escape, avenged him. Chion and Leonidas of Heraclea, disciples of Plato, conspired against the despots Clearchus and Satirus. Clearchus fell, but Satirus survived and avenged him. The Pazzi, of whom we have spoken so often, succeeded in murdering Giuliano only. From such conspiracies, therefore, as are directed against more heads than one, all should abstain; for no good is to be got from them, whether for ourselves, for our country, or for any one else. On the contrary, when those conspired against escape, they become harsher and more unsufferable than before, as, in the examples given, Florence, Athens, and Heraclea had cause to know. True it is that the conspiracy contrived by Pelopidas for the liberation of his country, had to encounter every conceivable hindrance, and yet had the happiest end. For Pelopidas had to deal, not with two tyrants only, but with ten; and so far from having their confidence, could not, being an outlaw, even approach them. And yet he succeeded in coming to Thebes, in putting the tyrants to death, and in freeing his country. But whatever he did was done with the aid of one of the counsellors of the tyrants, a certain Charon, through whom he had all facilities for executing his design. Let none, however, take this case as a pattern; for that it was in truth a desperate attempt, and its success a marvel, was and is the opinion of all historians, who speak of it as a thing altogether extraordinary and unexampled.

The execution of a plot may be frustrated by some groundless alarm or unforeseen mischance occurring at the very moment when the scheme is to be carried out. On the morning on which Brutus and his confederates were to slay Cæsar, it so happened that Cæsar talked for a great while with Cneus Pompilius Lenas, one of the conspirators; which some of the others observing, were in terror that Pompilius was divulging the conspiracy to Cæsar; whose life they would therefore have attempted then and there, without waiting his arrival in the senate house, had they not been reassured by seeing that when the conference ended he showed no sign of unusual emotion. False alarms of this sort are to be taken into account and allowed for, all the more that they are easily raised. For he who has not a clear conscience is apt to assume that others are speaking of him. A word used with a wholly different purpose, may throw his mind off its balance and lead him to fancy that reference is intended to the matter he is engaged on, and cause him either to betray the conspiracy by flight, or to derange its execution by anticipating the time fixed. And the more there are privy to the conspiracy, the likelier is this to happen.

As to the mischances which may befall, since these are unforeseen, they can only be instanced by examples which may make men more cautious. Giulio Belanti of Siena, of whom I have spoken before, from the hate he bore Pandolfo Petrucci, who had given him his daughter to wife and afterwards taken her from him, resolved to murder him, and thus chose his time. Almost every day Pandolfo went to visit a sick kinsman, passing the house of Giulio on the way, who, remarking this, took measures to have his accomplices ready in his house to kill Pandolfo as he passed. Wherefore, placing the rest armed within the doorway, one he stationed at a window to give the signal of Pandolfo’s approach. It so happened however, that as he came nigh the house, and after the look-out had given the signal, Pandolfo fell in with a friend who stopped him to converse; when some of those with him, going on in advance, saw and heard the gleam and clash of weapons, and so discovered the ambuscade; whereby Pandolfo was saved, while Giulio with his companions had to fly from Siena. This plot accordingly was marred, and Giulio’s schemes baulked, in consequence of a chance meeting. Against such accidents, since they are out of the common course of things, no provision can be made. Still it is very necessary to take into account all that may happen, and devise what remedies you can.