Siena is presented not through a sustained local description but through the political calculations of rulers seeking to control Tuscany. Its significance lies in the way it reveals the geographic and political logic of expansion: a city can become valuable as soon as surrounding powers are weakened, yet possession alone does not secure lasting authority. Siena also serves as an example of the unstable sources of political loyalty, since its ruler, Pandolfo Petrucci, governed by relying on men whom he had previously distrusted.

Siena in Cesare Borgia’s Tuscan Design

Siena enters the narrative as one of the cities that would have been drawn into Cesare Borgia’s power if his projected conquest of Tuscany had succeeded. He already held Perugia and Piombino and had assumed the protectorship of Pisa, intending to move against Pisa next. Once Pisa fell, Lucca and Siena were expected to yield soon afterward. Their likely submission is attributed to two pressures working together: jealousy of Florence and fear of Cesare Borgia’s growing power. The consequence would have been a desperate position for the Florentines, whose security would have been threatened by the consolidation of a single expanding power across Tuscany.

This projected sequence places Siena within a chain of political consequences rather than treating it as an isolated objective. Pisa was the immediate point of attack, while Lucca and Siena were anticipated gains produced by the collapse of the balance around it. Siena therefore marks the scale of Cesare Borgia’s ambition: he was not merely defending Romagna, but attempting to convert a series of strategic footholds into an independent territorial power. Had these plans succeeded, his authority and reputation might have become strong enough for him to rely on his own resources rather than on the power and fortune of others.

Political Loyalty and Pandolfo Petrucci

Siena is also associated with Pandolfo Petrucci, Lord of Siena, whose conduct illustrates a more complicated form of political management. Petrucci governed through men whom he had once distrusted, preferring them to those who had enjoyed his confidence from the beginning. Their former hostility did not necessarily make them useless. If they still required the ruler’s support, they could be won over, and their knowledge that they had to erase an unfavorable impression through later conduct could bind them more closely to his service.

The example makes Siena a setting for a general distinction between apparent loyalty and politically useful loyalty. Men who serve a ruler in complete security may become careless about his affairs, whereas former opponents remain conscious that their position depends on proving themselves. Petrucci’s practice suggests that political allegiance can be manufactured through dependence and the controlled conversion of suspicion into obligation. The city thus appears not only as a territorial prize but also as a political laboratory in which the management of former enemies becomes a means of preserving rule.

Siena Among States and Conquests

The broader discussion places Siena within the problem of acquiring and retaining states whose political conditions cannot be mastered by force alone. The text contrasts territories that can be incorporated into an existing dominion with those whose laws, language, customs, or political traditions create special difficulties. In neighboring or related territories, security may be assisted by continuity of laws and taxes; in more difficult provinces, a ruler may need to reside there, establish colonies, protect weaker neighbors, weaken stronger ones, and prevent an equally powerful stranger from entering.

These principles illuminate the danger implicit in the plan to bring Siena under Cesare Borgia’s influence. A city that yields through fear or rivalry may not remain a dependable possession once the immediate pressure changes. The narrative repeatedly distinguishes between a conquest made possible by local discontent and a government made durable by stable foundations. Siena’s anticipated submission therefore carries an element of uncertainty: its people might accept a new power because they feared Cesare Borgia or resented Florence, but such motives would not automatically create lasting attachment.

Siena and the Problem of Political Strength

Siena’s role also belongs to the text’s larger measure of princely strength. A ruler is strong when he can assemble an army capable of taking the field against any assailant; one who cannot do so must withdraw behind fortified walls and depend on the security of his towns and the disposition of his subjects. In this framework, a city’s strategic value depends on more than its nominal allegiance. Its position must be supported by military resources, political obedience, and the ruler’s capacity to act before disorders become visible and difficult to cure.

The contrast between Cesare Borgia’s expanding design and the text’s account of durable rule is especially important. Cesare Borgia increased his reputation when he moved away from French auxiliary forces and unreliable mercenaries, including the Orsini and Vitelli, and relied instead on troops of his own raising. Siena was imagined as part of the territory that such growing strength might absorb, but the city’s place in the plan also exposes the difference between momentum and security. Expansion could make Siena yield; only independent power and disciplined government could make that submission endure.

Narrative Significance

Siena is therefore a compact but revealing location in the political geography of the work. It stands at the edge of Cesare Borgia’s proposed Tuscan advance, linked to Pisa, Lucca, Florence, Perugia, and Piombino, and its expected submission shows how fear and rivalry can transform regional power. At the same time, its association with Pandolfo Petrucci gives the city a second significance: rule is sustained not simply by eliminating opposition, but by converting former distrust into useful dependence.

Because Siena is mentioned chiefly through plans and examples rather than through a narrated civic episode, its narrative force is prospective and analytical. It is a city imagined as about to change hands, and that imagined change allows the text to examine the conditions under which conquest becomes government. Siena embodies the uncertain middle ground between acquiring a state and possessing the foundations required to keep it.