During a survey of the building in the 1990s, an 11th-century walled-up gateway leading to the north courtyard was found in the church, along with various funerary inscriptions on the wall. These already suggested that the monks may have had their cemetery in this area. Our excavation revealed the remains of several graves in the higher parts of the courtyard. As the area here was also extremely disturbed, no completely intact burials were found. Sometimes the skull of one of the buried persons, sometimes his legs, sometimes his entire upper body was missing due to later construction. The graves had no attachments of any kind next to the dead, which is in keeping with medieval burial customs. Carbon isotope analysis of the bones proved that these graves are the final resting place of the earliest inhabitants of the monastery. This is confirmed by the discovery of late medieval tombs in the cloister area by Csaba László during previous research.
The excavated tombs also confirm that the 11th century sanctuary of the basilica is certainly identical in shape to the one visible today, as the early tombs east of the sanctuary were aligned with the 13th century wall.