The Slavs and the Old Prussians. Poland in the Early Medieval Period / Славяне и Древние Пруссы. Польша в период Раннего Средневековья.: Three overlapping areas of inquiry were affected: a) the study of the origins of Early Slav culture in Poland, including the vital issue of Slav ethnic origins; b) the study of the nature and dynamics of the complex culture shift which eventually led to