*Karl-Heinz Uthemann (1994). "Saint Porphyrius". In Bautz, Traugott (ed.). Biographisch-Bibliographisches Kirchenlexikon (BBKL) (in German). Vol. 7. Herzberg: Bautz. cols. 848–854. ISBN3-88309-048-4.. Since no evidence of a substitution is presented, a more parsimonious reading of the text would have reported simply that Praylius is reported, when the historical figure was actually John II of Jerusalem.
