Victor IV (antipapa 1159-1164)
Victor IV , nomine nativo Octaviano de' Crescenzi Ottaviani de Monticelli (natus Tiburi anno 1095 ; Lucae mortuus die 20 Aprilis 1164) fuit antipapa ab anno 1159 usque ad mortem, id est sub pontificatu papae Alexandri III. Ab imperatore Friderico I favebatur.

Bibliographia 
 F. Barlow, "The English, Norman and French Councils Called to Deal with the Papal Schism of 1159" in English Historical Review vol. 51 (1936)
 H. Boehmer, "Carmina ad schisma Alexandrinum pertinentia" in  Libelli de lite vol. 3 (1897) pp. 547-554
 Mary G. Cheney, "The Recognition of Pope Alexander III" in English Historical Review vol. 84 (1969)
 
 P. Kehr, "Zur Geschichte Victors IV."in Neues Archiv vol. 46 (1926)
 I. S. Robinson, The Papacy, 1073–1198: Continuity and Innovation (Cantabrigiae: Cambridge University Press, 1990) pp. 472-497
 H. Schwarzmaier, "Zur Familie Viktors IV. in der Sabina" in Quellen und Forschungen aus italienischen Archiven und Bibliotheken vol. 48 (1968)

Nexus externi 
 
 
 John Paul Adams, "Sede Vacante 1159" et Documenta

Legati pontificales
Antipapae
Mortui 1164
Nati 1095
Alexander III (papa)
Fridericus I (imperator)