Giovanni Borgia, 2nd Duke of Ganda was the son of Pope Alexander VI a member of the House of Borgia who was murdered in 1497. He was the brother of Cesare, Gioffre, and Lucrezia Borgia. Giovanni, commonly known as Juan , is believed to be the eldest of the Popes four children by Vannozza dei Cattanei, but this is disputed. Due to the contents of a number of papal bulls issued after his murder, it is unclear whether Giovanni was born in 1476 or 1477.
Giovanni Borgia was probably born in Rome to thencardinal Rodrigo Borgia , and his mistress, Vannozza dei Cattanei, who was married to Domenico da Rignano. Giovanni married Maria Enriquez de Luna, the Spanish betrothed of his deceased older halfbrother, Pedro Luis, in September 1493. He was made 2nd Duke of Gandia, Duke of Sessa, Grand Constable of Naples, Governor of St. Peters, and Gonfalonier and Captain General of the Church.
Source: Wikipedia