Medieval glazed ceramics, dated to the early 15th century, excavated at the
Belgrade Fortress, Serbia, was investigated combining optical microscopy,
X-ray powder diffraction (XRPD), scanning electron microscopy with
energy-dispersive spectroscopy (SEM-EDS), micro-Raman spectroscopy and
multivariate statistical analysis. Decoration and style of investigated
ceramics were characteristic of workshops from different areas of medieval
Serbian state: Ras, Krusevac and Belgrade/Smederevo. Comparison was made
with ceramic samples from the same period excavated at the Studenica
Monastery, the earliest workshop discovered so far, which were used as
reference material for Ras area. Ceramics from the Belgrade Fortress was
covered with transparent, lead-based glaze. Majority of the glazes were
produced by application of mixture of lead oxide and quartz to the clay
body, whereas only two samples were glazed by application of lead oxide by
itself. Brown colours of the glaze originate from Fe-based spinel, whereas
copper and iron were responsible for the coloring of the green and yellow
glazes. The obtained results revealed glazing technology taken from
Byzantine tradition.