He was created as Spaniard. Please Google "Cesare Borgia".

A passage quoted from Wikipedia,"Cesare was initially groomed for a career in the church. He was made Bishop of Pamplona at the age of 15. Following school in Perugia and Pisa where Cesare studied law, along with his father's elevation to Pope, Cesare was made Cardinal at the age of 18.[4] Alexander VI staked the hopes of the Borgia family in Cesare's brother Giovanni, who was made captain general of the military forces of the papacy. Giovanni was assassinated in 1497 in mysterious circumstances: with several contemporaries suggesting that Cesare might be his killer,[6] as Giovanni's disappearing could finally open him a long-awaited military career; as well as jealousy over Sancha of Aragon, wife of Cesare's other brother Gioffre, and mistress of both Cesare and Giovanni.[7] Cesare's role in the act, however, has never been clear.

On August 17, 1498, Cesare became the first person in history to resign the cardinalate. On the same day the French King Louis XII named Cesare Duke of Valentinois, and this title, along with his former position as Cardinal of Valencia, explains the nickname "Valentino"."