The archdiocese basilica of the Holy Apostles Peter and Paul is the city's oldest historical monument. Its origins date back to 968, when the Poznan diocese was created. The cathedral is a three - nave basilica, with an ambulatory around the chancel. There are 12 chapels and 2 sacristies adjacent to the side naves and the ambulatory. The cathedral is home to many precious works of art. The cathedral was the stage for many historical events, including the funerals of medieval kings and princes (the church is the oldest necropolis of the Piast dynasty rulers).