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Issue of Actual Chronology of a Romanesque Chapel at the Wlen Castle (Lower Silesia, Poland) in the Light of Mortar Radiocarbon Dating The presented work discusses results of radiocarbon dating of lime mortars sampled from walls of a Romanesque chapel at the Wleń castle. Considering a homogeneous structure of the mortars, an attempt to determine the chronology was made. Radiocarbon dating was carried out both on carbonate binders and laboratory-selected charcoals from the mortars. According to obtained data, charcoal ages are older than the age of the binders. Assuming the 12th century chronology of the chapel's erection to be correct, it was found that the applied method did not provide the result which is consistent with archaeological estimations.