There is a contemporary tract, Altercatio inter Urbanum et Clementum, arguing the two popes claims should be adjudicated by a council. In March 1095 Conrad attended the Council of Piacenza and confirmed his stepmother Eupraxia's accusations that Henry IV was a member of a Nicolaitan sect, participated in orgies and had offered Eupraxia to Conrad, stating that this was the reason for his turning against his father.
Henry IV
Conrad