We know that at the time of the monastery's foundation, in the 11th century, there was already a royal manor house on the hill of St Martin. One of the questions of our research was whether the last thousand years had left no trace of it, or whether there were still any reminders of this building. On the site where the building probably once stood, there is now a Classicist library building. It has been suggested that there may be archaeological evidence in the northern courtyard, between the Baroque wing of the monastery and the basilica, which could confirm this. The excavation started next to the block of the late medieval sacristy, but it soon became clear that substantial regrading had been carried out here in the first half of the 20th century, so that only the sandstone forming the hill was found beneath the present pavement. One detail gave some hope: the square foundation excavated in the middle of the courtyard. However, only the lowest rows of stones, sunk into the rock, were found, and we were not able to observe any archaeological features, so that neither its age nor its function could be determined.