Bulgarian documentary and literary sources are considerably less in quantity than the rich Greek and Latin material dating to the period 1204-1261. Nevertheless these sources are capable of making a valuable contribution to prosopography. My goal here is to classify the written evidence from Bulgaria and trace some of its features and particular utility for prosopography. Also of interest is the Bulgarian perspective on the two main successor states to the Byzantine imperial tradition after 1204, the empires of Nicaea and Epiros, and on Byzantine civilization in general.1 Finally, it is relevant to the task at hand to highlight one of the main challenges that the prosopography of the Byzantine world (1204-1261) would encounter in establishing the profile of individuals mentioned in the Bulgarian sources: the differentiation between Greek (Byzantine) and Bulgarian ethnic identity.