Igor K?kolewski is a professor and Director of the Centre for Historical Research in Berlin, Polish Academy of Sciences. His research focuses on early modern history of Poland-Lithuania and Europe, history of Polish-German relations, studies in memory culture. Christian Lübke is a professor and Director of the Leibniz Institute for the History and Culture of Eastern Europe, Leipzig. His research fields include history of the Middle Ages in Poland and Central and Eastern Europe, Russian history, social and economic history. Przemys?aw Urba?czyk is a professor and Director of the Polish Institute of Advanced Studies, Polish Academy of Sciences. His research focuses on archaeology and history of the Middle Ages in Poland, Central Europe, Scandinavia and North Atlantic region.