House of Borgia
Giovanni Borgia (March 1498 – 1548), known as the Infans Romanus ("the Roman child"), was born into the House of Borgia in secret and is of unclear parentage. Speculations of the child's parentage involve either Lucrezia Borgia with her alleged lover, Perotto Calderon or Cesare Borgia, or Pope Alexander VI as his father. Cesare Borgia's biographer Rafael Sabatini says that the truth is fairly clear: Alexander fathered the child with an unknown Roman woman.