The fourth volume of the five-volume edition “Ancient Rus' in the light of foreign sources: Reader” contains translations of selected Western European (German, Polish, French, Italian, Hungarian, Czech) sources of the 9th-13th centuries, written, as a rule, in Latin. Among them are texts of various genres: annals and chronicles, lives, legal documents, messages. All texts are provided with archaeographic information, historical and philological commentary and selected bibliography, numerous genealogical tables, a terminological glossary, detailed indexes of personal names, as well as geographical and ethnic names are attached.