Guidobaldo da Montefeltro

Guidobaldo (Guido Ubaldo) da Montefeltro (January 17, 1472 – April 10, 1508), also known as Guidobaldo I, was an Italian condottiero and the Duke of Urbino from 1482 to 1508.

Biography
Born in Gubbio, he succeeded his father Federico da Montefeltro as Duke of Urbino in 1482.

Guidobaldo married Elisabetta Gonzaga, the sister of Francesco II Gonzaga, Marquis of Mantua. Guidobaldo was impotent, and they had no children, but Elisabetta refused to divorce him.

He fought as one of Pope Alexander VI's captains alongside the French troops of King Charles VIII of France during the latter's invasion of southern Italy; later, he was hired by the Republic of Venice against Charles. In 1496, while fighting for the Pope near Bracciano, Guidobaldo was taken prisoner by the Orsini and the Vitelli, being freed the following year.

Guidobaldo was forced to flee Urbino in 1502 to escape the armies of Cesare Borgia, but returned after the death of Cesare Borgia's father, pope Alexander VI, in 1503. He adopted Francesco Maria della Rovere, his sister's child and nephew of pope Julius II, thus uniting the seigniory of Senigallia with Urbino. He aided pope Julius II in reconquering the Romagna.

The court of Urbino was at that time one of the most refined and elegant in Italy. Many men of letters met there. The Italo-English historian Polydore Vergil may have worked in the service of Guidobaldo and Elisabetta as well as Baldassare Castiglione, the author of the book Il Cortegiano, which describes the court of Urbino.

Suffering from pellagra, Guidobaldo died in Fossombrone at the age of 36. He was succeeded by his nephew Francesco Maria della Rovere whom the childless Guidobaldo had named as his heir.