“…Building mortars, as the material directly linked to the construction of the building, can be a valuable source of information about its age, being aware of the limitations resulting from the presence of carbonate aggregate and recrystallization of binder (Lindroos et al, 2007, Nawrocka et al, 2009a, 2009b, (causing rejuvenations of results; not present in analyzed samples), as both those factors have considerable influence on the 14 C measurement results. Radiocarbon dating of mortars requires special sample preparation methodology, larger than standard amount of a sample and somewhat longer time for its preparation.…”