Pedro was the son of Francisco Téllez-Girón, 10th Duke de Osuna, the 10th Duke of Osuna, and of María Francisca de Beaufort Spontin y Toledo. The Téllez-Girón family had held title over the Dukedom of Osuna since 1562 with the rise of Pedro Téllez-Girón.
He was the 14th Duke of the Infantado, the 11th Duke of Osuna and the holder of various titles associated with those Dukedoms. Pedro inherited the Dukedom of Osuna after the death of his father in 1820. He died in 1844 without leaving behind any heirs.
Dukedoms Marquisates Counties.
XI Duke of Osuna X Duke of Pastrana XIV Duke of the Infantado XIV Duke of Béjar XIII Duke of Arcos XIV Duke of Benavente XV Duke of Plasencia XV Duke of Gandía X Duke of Mandas y Villanueva XIII Duke of Rioseco XI Duke of Lerma Duke of Estremera Duke of Francavilla XIII Marquis of Peñafiel, XV Marquis of Santillana, XVI Marquis of Tavara, Marquis of Terranova, Marquis of Cea, Marquis of Gibraleón, Marquis of Lombay, Marquis of Zahara, Marquis of Cenete, Marquis of Angüeso, Marquis of Almenara, Marquis of Algecilla, Marquis of Cea XVI Count of Benavente, XV Count of Ureña, Count of Mayorga, Count of Bañares, Count of Oliva, Count of Mayalde, Count of Belalcázar, Count of Real de Manzanares, Count of Saldaña, Count of the Cid, Count of Melgar de la Frontera, Count of Bailén, Count of Villada.
