The three-part hillfort in Lubomia, Wodzisław district (site 1, AZP 103-41/50) is the largest, one of the best preserved and one of the best excavated, early medieval hillforts of Śląskie Voivodeship. The aim of the authors was to integrate the archival research with the outcomes of remote sensing methods and, as a result, to supplement knowledge on the monument. The first of the applied methods was the analysis of data from airborne laser scanning (LiDAR, ALS), the second – geophysical (magnetic) research. They allowed to gather new information about the monument, and above all to discover its second, western subsidiary settlement (C). The objective has been achieved and it has been shown that the non-intrusive prospection of the site was justified, despite various independent constraints. This type of research and preservation activity should be obligatory for other archaeological sites, especially if they have a terrain form, and especially if excavations are planned. Keeping in mind that the preservation of the archaeological site in situ is nevertheless a priority.