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.[1][2]
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.[3] The large number of people present required that the council had to be held outside of the city.