He was born in
Naples as the son of Leonetto Sanseverino and Elisa Sforza, sister of
Francesco Sforza, Duke of Milan. He assumed the surname of Aragon by concession of the king of the Kingdom of Naples
Ferrante of Aragon. He was a general in the service first of his uncle Francesco Sforza, on whose behalf he defended
Arcevia from the attacks of Piccinino (1442–1443) and then in the sieges of
Pavia,
Cremona,
Como and in the
battle of Caravaggio (1447–1449). Always in the service of Sforza, who in the meantime became Duke of Milan, with Bartolomeo Colleoni he beat the Venetians at
Genivolta in July 1452. In 1458 he went on pilgrimage to the Holy Land and left a detailed diary of the journey. On his return he was sent by the Sforza, in the second fortnight of October 1460 to the aid of the king of the
Kingdom of Naples Ferrante d'Aragona and participated until 1464 in the war between the Aragonese and the Angevins for the possession of the Kingdom, following the
conspiracy of the Barons. Between 1462 and 1463 he distinguished himself in the subjugation of numerous Apulian cities still rebellious: Accadia, Troia, Serracapriola, Manfredonia and Monte Sant'Angelo. His role at the
battle of Troia was particularly impactful, leading the heavy cavalry to victory and securing his throne. He came into conflict with King Ferrante, who would not have granted him what he had been promised, and then also with the Duke of Milan, with whom he did not find an agreement for the renewal of the conduct; he then passed into the service of the Republic of Florence against the Republic of Venice and on 25 July 1467 participated in the
battle of Riccardina (also called the Battle of Molinella), where he was noted for his valor. In 1471 he again stipulated a four-year conduct with Galeazzo Maria Sforza who also renewed the investiture of Colorno. His company at that time often stayed in Romagna and Roberto frequented the lords of
Bologna, the
Bentivoglio, to whom he was linked by friendship: he was present in Bologna when the very young Hannibal was knighted by King
Christian I of Denmark in 1474. In the autumn of 1476 he fought in the Duchy of Savoy against the troops commanded by the Duke of Burgundy
Charles the Bold, sacking Santhià and San Germano Vercellese. But in December he was forced to return quickly to Milan where Duke
Galeazzo Maria Sforza had been assassinated. During the regency of the Duchy of
Bona of Savoy, mother of Gian Galeazzo Maria, he came into conflict with
Cicco Simonetta, advisor to the regent, who did not renew his contract of conduct and who for this reason later became unpopular with the Ghibelline party. Ludovico Sforza, with the help of his brother Sforza Maria, tried to oppose the regency of Bona and tried to defeat Simonetta with weapons, but was forced into exile; even the Sanseverino fled, passing the Ticino with some of its veterans and cutting the rope of the port so that it could not be pursued. Here he showed great cunning when, having learned that Count Borella da Caravaggio by order of Cicco Simonetta was chasing him, he spread the rumor among the villains of the place that it was instead he himself to chase Count Borella with the task of capturing him for "some sceleraggini" committed against the Duke of Milan. The villains believed in Sanseverino and not in Count Borella, who was imprisoned, so that Roberto could safely reach
Asti and from here France; sentenced in absentia to beheading, his assets were confiscated in favor of
Ercole I d'Este. He then became captain general of the
Republic of Genoa which he defended from the attack of the Milanese (1478). The following year he was under the service of
Pope Sixtus IV in the war against Florence. While returning from Tuscany he was joined in
Lunigiana by Galeazzo Maria Sforza and Ludovico Sforza who fled from exile who with the support of the king of Naples tried to return to Milan still under the regency of Bona of Savoy. Sanseverino was convinced to support the decisive attack and after the conquest of Tortona and the capture of various castles and strongholds entered Milan in September 1479, also following the reconciliation of Ludovico Sforza with the Duchess Bona. Roberto was given back his possessions and had Lugano, Balerna and Mendrisio in fief. He was called to be part of the ducal council, until 1481, when he had disagreements with the new duke. In 1482 he was hired by Venice: between the spring and summer of that year he was engaged in the long and exhausting war against Ferrara instigated by
Girolamo Riario, lord of Forlì, with the support of Pope Sixtus IV: in May the Venetian troops, led by Roberto Sanseverino, attacked the
Duchy of Ferrara from the north, conquering the territory of Rovigo, sacking Comacchio and besieging Ficarolo (which capitulated on 29 June). In addition, starting from
Ravenna, they attacked from the south-east, taking
Argenta and going up the Po di Primaro from the mouth. In November the Venetians arrived under the walls of Ferrara which was under siege. The military situation changed radically in December when Pope Sixtus IV, under pressure from
Ludovico il Moro, Duke of Milan, who feared that the Serenissima would become too powerful and therefore dangerous for the Duchy of Milan, changed alliance and made peace with the Este to fight the Venetians. With the Peace of Bagnolo, on August 7, 1484, Venice retained almost all the conquered possessions; Sanseverino was elected captain general of the Italian League for nine years; he was given a conduct of 600 spears and an annual salary of 120,000 ducats (6,000 to be paid by the pontiff, 8,000 by the king of Naples, 50,000 by Venice, 50,000 by the Duke of Milan and 6,000 by Florence). He was returned the assets confiscated in the Kingdom of Naples and in Milan; his son Giovan Francesco was assigned the county of Caiazzo. In October 1485 Roberto obtained permission from the Venetians to pass to the pay of the Papal States to fight the Aragonese and the Orsini, their allies. The military campaign, however, turned out to be a defeat and
Pope Innocent VIII himself, at the appropriate time, found an agreement with the Neapolitans and fired Sanseverino who, apparently, blackmailed the pontiff, threatening to abandon him if he did not grant one of his sons the title of cardinal. The Sanseverino fled chased by the troops of the enemy daringly towards the borders of Venice and then took refuge in his possessions near Cittadella.
Death He returned to command of the Venetian troops in the war that arose for reasons of duties against Sigismund of Habsburg in 1487; he occupied Rovereto and from the Val Lagarina he focused on Trento. He occupied the Castle of Nomi, Castel Pietra and Castel Beseno, but on August 10 in an ambush in the battle of Calliano the Sanseverino was overwhelmed in the route. Hearing that the Germans were coming down armed from the mountains in large quantities, he with his men went back to the
Adige river, but found that the bridge had already been broken by Andrea dal Borgo for fear that the enemies would pass, or in an attempt to force the Venetian soldiers to fight. Then, seeing himself trapped, he began to urge the soldiers to turn to the enemies and want to fight and die valiantly, but those preferred to swim in an attempt to cross the river, and for the most part drowned. Robert alone fought with a few brave trusted and was mortally wounded in the throat, saying he preferred a glorious death rather than drowning in the river as many did. Messer Pedro, his secretary, stated that, before dying, Robert received a sword wound in the eye, two of schioppetto: one in the arm and the other in the knee; a blow of the sword to the right hand and finally a blow, deadly, of spear to the neck. According to another source, he was pierced to death by a Colleonesco soldier and pushed into the river.
Ludovico il Moro, who seemed to take pleasure in the death of his great enemy, painted him instead while several times he tried to escape, without success, towards the river, and died not in battle but on the way to Trento, where he was to be taken prisoner. In Venice in the Doge's Palace the following inscription was placed in his memory:Bellorum domitor, Severina stirpe Robertus/ Alter qui nostro tempore Cesar erat,/ Cuius virtutem Feraria ferrea sensit/ Horruit Aemilia celsasque Roma tremit./ Frenavit Janue partes Liguremque superbum/ Italiae terror teutonicusque metus,/ Fortuna invida regat posta fata Tridenti,/ Quod non vita sibi, mors inopina dedit. == Appearance and personality ==