The excavations by Konrad Spindler from 1978 to 1980 on the steep slope of the Frauenberg revealed the ground plan of a stone building, probably 41 m long and 15 m wide,
which he described as a late Roman small fort (so-called burgus) and which has been partially reconstructed here.

The evaluation of the excavation results from 2004 to 2007 in the Frauenberg church, the renewed examination of the finds from Spindler’s excavations and current scientific analyses have led to changed views on the chronology of this stone building on the edge of the mountain plateau.
Dating the building to late antiquity is no longer valid; Mathias Hensch and Michael M. Rind were able to prove that it is a medieval building, probably from the 10th century.

The hypothesis put forward by Konrad Spindler that the large building ground plan in the immediate vicinity of the Wolfgangswall was a Valentinian burgus can no longer be upheld, even after the discovery of the imposing building of about the same size at the Frauenberg church.
The reconstructed building findings here thus also agree with the excavation results of Walter Sage in 1966 at the southwest end of the Wolfgangswall, who uncovered a wooden and stone gateway system of the 10th century there.

During an excavation by the Kelheim District Archaeology Department in 1997, an iron smelting site with four iron smelting furnaces was discovered on the hilltop above the monastery in the area of today’s flood-protected parking area, which can also be dated to the Ottonian period of the 10th century.
The new interpretation of the construction findings at Weltenburg Frauenberg clearly prove that the mountain spur was of great importance at the beginning of the High Middle Ages as a palace complex of the Regensburg bishops, which was handed down as a Palatine „Weltinopolis“ in the 11th century.