The "Petersfriedhof" was probably laid out during the foundation of the monastery about 700. The burial ground was first mentioned under the rule of Archbishop Conrad I in 1139, with the oldest preserved graves from 1288 and 1300. It is centred around Late Gothic St Margaret's Chapel and the Chapel of the Cross, dedicated about 1170 and refurbished as a mausoleum according to plans by Santino Solari in 1614/15. Several tombs are located in arcades built at the foot of the Festungsberg hill.