During Henry's campaigns in Italy, he took Eupraxia-Adelaide with him and kept her imprisoned at the monastery of San Zeno, where the emperor and his troops traditionally stayed, just outside the walled city of Verona. She escaped in 1093 and fled to Canossa, where she sought the aid of Matilda of Tuscany, one of Henry's enemies. Eupraxia-Adelaide accused Henry of ill-treating her in a letter that was read at legatine synod held in Constance in April 1094. The following year, at the urging of Pope Urban II, Eupraxia-Adelaide made a public confession before the church Council of Piacenza, held in the first week of March. She accused Henry of holding her against her will, of forcing her to participate in orgies, and, according to some later accounts, of attempting a black mass on her naked body. According to these later chroniclers, Henry became involved in a Nicolaitan sect, and hosted the sect's orgies and obscene rituals in his palaces. Eupraxia-Adelaide was forced to participate in these orgies, and on one occasion Henry allegedly offered her to his son, Conrad. Conrad refused indignantly, and then revolted against his father. He began to support the papal side in the Italian wars which formed part of the Investiture Controversy. This legend takes its origin from the hostility between Henry and Urban II during the Investiture Controversy.