Byzantine history (X-XIII c. and mid-V-mid-VIth centuries). I am interested in social and political history as well as in the history of law. Beyond Byzantine frontiers two regions of medieval Europe are also important for my studies - Eastern Europe (including Poland, Hungary, Scandinavia) and the Mediterranean - Italy and the Iberian peninsula. I am also interested in modern historiography of the Middle Ages - especially in romanticism and positivism.