Saint James Church in Toruń is one of the most important gothic monuments in Poland. The date of the beginning of its construction is known from historical reports but the earlier history of the site remains undiscovered. During the archaeological excavations in years 2010 and 2011 five brick samples were collected for luminescence dating as well as four additional samples from the brick surroundings for the dose rate estimation. The equivalent dose was determined by TL and OSL methods. The TL results differ significantly from the OSL results but the last ones are verified by historical knowledge and radiocarbon dating. Establishing the dose rate from gamma rays needs a special attention because of the complex course of the foundations of the church. The details of the applied approach are presented in the current work. The results obtained indicate that a solid brick construction existed at the site of the presbytery of the Saint James Church before it was build.

ABSTRACT. The archaeological excavations conducted in the spring of 2011 in yard No. 7 in the vicinity of old market at Plac 20 Października (20th October Square) were the first in the history of the town large-scale investigations of residential urban area in Mosina. Late-medieval and modern relics of buildings have been unearthed, and an extremely interesting assemblage of the fifteenth-eighteenth century pottery and small objects of everyday use collected. The absence of materials dating from the fifteentheighteenth-century Middle Ages speaks in favour of the thesis suggested by researchers that Mosina might have been translocated into its present location from neighbouring Niwka.