Brepolis Medieval Encyclopaedias includes the Lexikon des Mittelalters, the International Encyclopaedia of the Middle Ages, and Europa Sacra.
- The Lexikon des Mittelalters (LexMA) is an indispensable tool for medievalists across all disciplines. It deals with all branches of Medieval Studies and covers the period from 300 to 1500 AD/CE for the whole of Europe and parts of the Middle East and North Africa. The ancient roots of Western Culture, as well as neighbouring cultures, such as the Byzantine, the Arabic and the Jewish, occupy a prominent position in the encyclopaedia.
- The purpose of the International Encyclopaedia of the Middle Ages (IEMA) is to offer newly-written, commissioned, articles, fully peer-reviewed that supplement Lexikon des Mittelalters and offer supplementary notes to the original LexMA articles. The chronological range of IEMA is 3001500 CE, and it covers all of Europe, North Africa, and the Middle East.
- Europa Sacra offers complete coverage of Church prelates, information on all 1300 medieval bishoprics, archdioceses and patriarchates and prosopographical information on 18,507 bishops, archbishops and patriarchs.