The Council of Piacenza was a mixed synod of ecclesiastics and laymen of the Roman Catholic Church, which took place from March 1 to March 7, 1095, at Piacenza. The Council was held at the end of Pope Urban II's tour of Italy and France, which he made to reassert his authority after the investiture controversy with Henry IV, Holy Roman Emperor. Two hundred bishops attended, as well as 4000 other church officials, and 30,000 laymen. The large number of people present required that the council had to be held outside of the city. Attendants Among the lay attendees was Eupraxia of Kiev, a daughter of Vsevolod I, Prince of Kiev. She met with Urban II, and on his urgings Eupraxia made a public confession before the church council. Henry, she claimed, held her against her will, forced her into orgies, offered her to his son Conrad, and attempted to use her in a black mass. These accusations were confirmed in turn by Conrad, who stated that this was the reason he turned against his father. Also in attendance were ambassadors from Philip I of France, who came to appeal Philip's recent excommunication over his illegal divorce and remarriage to Bertrade de Montfort: Philip was given until Pentecost to rectify his situation. The rest of the business of the council expressed fairly typical church concerns: there were at least 15 canons published during the council, including a condemnation of the Berengarian heresy; a condemnation of the Nicolaitan heresy; an affirmation of the presence of Christ in the Eucharist; denunciations of the Antipope Clement III and his supporters; and a prohibition of payment to priests for baptisms, burials, or confirmations. Condemnation of simony One of Urban II's greatest achievements at Piacenza was the depth of detail of his Canons, in particular Canons 1 through 7 legislating universal condemnation of 'simony': the practice of building to acquire, and acquiring via purchasing, position, or ordination, within the Church. Ecclesiastical appointments stained by simony were decreed to be invalid and powerless. However, a temperate attitude was shown to those ordained by simoniacs who were not simoniacs themselves, and had no prior knowledge that the person ordaining them had no actual ecclesiastical authority to do so. Likewise, churches purchased by parents for their children were allowed to remain within the order; as were children so-ordained, but with benefices (official financial support from Rome) removed. Byzantine