Medieval iron-based weapons (a sword and two helmets) have been investigated using non-destructive and quasi-non-destructive techniques. These were: photon activation analysis with 30 MeV and respectively 16 MeV bremsstrahlung of an electron linear accelerator, energy-dispersive nuclide-excited X-ray fluorescence analysis, radiometric wall-thickness measurement and others. Authenticity assessment was the major objective. Regarding the results of the material investigations and those of stylistic, weaponry-scientific and weaponry-historical studies, the objects can be considered genuine with a high degree of confidence. However, the two helmets were found to be of lower quality with respect to the ground material used and the smithing technique applied.