Pedro Téllez-Girón, 3rd Duke of Osuna (17 February 1574 – 20 September 1624) was a Spanish nobleman and politician. He was the 2nd Marquis of Peñafiel, 7th Count of Ureña, Spanish Viceroy of Sicily (1611–1616), Viceroy of Naples (1616–1620), a Knight of the Order of the Golden Fleece since 1608, Grandee of Spain, member of the Spanish Supreme Council of War, and the subject of several poems by his friend, counselor and assistant, Francisco de Quevedo. Early life He was born in Osuna, province of Sevilla, and baptized on 18 January 1575, the son of Juan Téllez-Girón, 2nd Duke of Osuna, and of his wife Ana María de Velasco, daughter of Íñigo Fernández de Velasco, 4th Duke of Frías and Constable of Castile. According to the first biography published in 1699 by the Protestant Milanese Gregorio Leti, which has been until the 20th century the main and most exploited source of information on the third Duke of Osuna, when a boy he accompanied his grandfather, the 1st duke, Viceroy of Naples (1582–1586). But this, as many other pieces of information, anecdotes, speeches and stories of Leti's biography are doubtful nowadays; the same happens with his alleged participation, in the royal expedition to Zaragoza to put down the Aragonese revolt in 1588 as by then he was only aged 13. Pedro Téllez-Girón married on 17 January 1594 Catalina Enríquez de Ribera y Cortés In April 1594 he inherited the dukedom Afán de Ribera. Although deeply indebted, the estate of Osuna came under the Council of Castile administration because of his young age, to avoid money mismanagements. The estate of Osuna was only second by total wealth in Spain to that of the Duke of Medina Sidonia. In 1602, apparently with the agreement of Juan Fernández de Velasco, 5th Duke of Frías, Constable of Castile, his uncle and political godfather and one of the most powerful and outstanding personalities of the reign of King Philip III of Spain, Osuna escaped from his confinement in the castle of Cuéllar, a place/prison used for the last two centuries to control "illustrious" Crown guests accompanied by a servant, arriving in Brussels in October of that year. Military career Initially, he enlisted in the army of the Archduke Albert of Austria as a private, but soon he was given the command of two cavalry companies. In 1602 and 1603 he had a role in controlling and