House of Rosa Vannozza, the first mistress of Alexander VI. It is located near the Campo de' Fiori now a rather low section of Rome but in Alexander's day distinctly a residential neighborhood. Rosa Vannozza, also known as "Domina Rosa" or Lady Rose, was the mother of Cesare, Lucrezia and John Borgia and of two other children of the same father, Alexander VI. The house still shows traces of better days and a good style of architecture.