thumb|Portrait of Ugolino by [[Johann Kaspar Lavater]]
Ugolino della Gherardesca (March 1289), Count of Donoratico, was an Italian nobleman, politician and naval commander. He was frequently accused of treason and features prominently in Dante's Divine Comedy.
Biography
In the 13th century, the states of Italy were beset by the strife of two parties, the Ghibellines and the Guelphs. While the conflict was local and personal in origin, the parties had come to be associated with the two universal powers: the Ghibellines sided with the Holy Roman Emperor and his rule of Italy, while the Guelphs sided with the Pope, who supported self-governing city-states.
thumb|right|150px|Coat of arms of the [[Della Gherardesca family|House of della Gherardesca]]
Pisa was controlled by the Ghibellines, while most of the surrounding cities were controlled by the Guelphs, most notably Pisa's trading rivals Genoa and Florence. Under the circumstances, Pisa adopted the "strong and vigilant government" of a "armed with almost despotic power".
Ugolino was born in Pisa into the della Gherardesca family, a noble family of Germanic origins whose alliance with the Hohenstaufen emperors had brought them to prominence in Tuscany and made them the leaders of the Ghibellines in Pisa.
Between 1256 and 1258 he participated in the war against the philo-Genoese giudicato of Cagliari, in Sardinia. Ugolino then obtained the southwestern portion of the former Judicate, with its rich silver mines, where he founded the important city of Villa di Chiesa, today Iglesias.
thumb|left|200px|[[Ugolino and His Sons (Carpeaux)|Ugolino and his sons by Jean-Baptiste Carpeaux, 1861, Petit Palais.]]
As head of his family, the Ghibelline party and podestà of Pisa, Ugolino took action to preserve his power in the face of the political hostility of Pisa's neighbours. In 1271, through a marriage of his sister with Giovanni Visconti, judge of Gallura, he allied himself with the Visconti, the leaders of the Guelphs in Pisa. In doing so, he aroused the suspicions of his fellow Ghibellines.
The subsequent disorders in the city in 1274 led to the arrest of both Ugolino and Giovanni, who were accused of plotting to undermine Pisa's government and, with the support from Tuscany's Guelphs, share power among themselves. Ugolino was imprisoned and Giovanni banished from Pisa. Giovanni Visconti died soon afterwards, and Ugolino, no longer regarded as a threat, was set free and banished. In exile, Ugolino immediately began to intrigue with the Guelph cities of Florence and Lucca. With the help of Charles I of Anjou, he attacked his native city and forced it to make peace on humiliating terms, pardoning him and all the other Guelph exiles.
When Florence and Lucca took advantage of the naval defeat to attack Pisa, Ugolino was appointed for a year and succeeded in pacifying them by ceding certain castles. When Genoa suggested peace on similar terms, Ugolino was less eager to accept, for the return of the Pisan prisoners, including most of the leading Ghibellines, would have diminished his power.
Ugolino's gnawing of Ruggieri's head has been interpreted as meaning that Ugolino's hatred for his enemy is so strong that he is compelled to "devour even what has no substance." Ugolino, though punished for his betrayal of his people, is allowed some closure for the betrayal that he himself was forced to suffer under Ruggieri, when he is allowed to act as Ruggieri's torturer for eternity. According to Frances Yates, both are "suffering the torments of the damned in the traitors' hell; but Ugolino is given the right to oppress ... Archbishop Ruggieri with a ghastly eternal punishment which fits his crime."
Ugolino and his children
thumb|Ugolino and his sons in their cell, as painted by [[William Blake circa 1826.]]
thumb|Ugolino gnawing at his own fingers, in an engraving by [[Domingos Sequeira]]
According to Dante, the prisoners were slowly starved to death and before dying Ugolino's children begged him to eat their bodies.