«John (XVI) (antipope [997–998.]». britannica.com. «John (XVI), original name Giovanni Filagato, Latin Johannes Philagathus (b., Rossano, Calabria—d. Aug. 26, 1001), antipope from 997 to 998.»
«John (XVI) (antipope [997–998.]». www.britannica.com. [Consulta: -December-9-2010]. «John (XVI), original name Giovanni Filagato, Latin Johannes Philagathus (b., Rossano, Calabria—d. Aug. 26, 1001), antipope from 997 to 998. A monk of Greek descent whom the Holy Roman emperor Otto II named abbot of the monastery of Nonantola, Italy, he attained an influential position at the court of Otto’s widow, the empress Theophano.»
