Germanische Altertumskunde Online (Germanic Antiquity Studies Online) - just like the Reallexikon that has merged with it - is accompanied by supplementary volumes. This series comprises both monographs and edited volumes on specific topics from the fields of archaeology, history, and literary studies. It thus expands the database with the inclusion of aspects that require comprehensive analysis. More than 100 volumes have now appeared, from Germanenproblemen in heutiger Sicht (The Problems of Germanic Peoples from a Contemporary Perspective) to Germanische Altertumskunde im Wandel (Germanic Antiquity Studies in Flux).

The Prosopography of the Middle Byzantine Period is a comprehensive biographical dictionary for the Eastern Mediterranean, including Byzantine Italy, in the Early Middle Ages. It is published in two sections, each comprising five volumes, and documents over 20,000 people. The first section covers the period from 641 to 867, the second extends to 1025. Apart from the five main volumes, each section contains an additional introductory volume, Prolegomena , containing principally information about the most important sources for the period - both Byzantine and non-Byzantine - together with a concluding volume with the definitive list of abbreviations, the indexes, and addenda and corrigenda. The work covers firstly all Byzantines mentioned either by name or anonymously in the relevant Byzantine and non-Byzantine sources, and secondly all persons mentioned in the Byzantine sources both from Western Europe and from the Arabic and Slavonic areas, together with those from the Christian East. The articles on the individual people bring together all known details in each case and give information on the present state of research. Both sections contain comprehensive indexes of names, variants of names, offices, titles, places and geographical terms, which facilitate use of the work. A subject index and online versions of all the indexes are in preparation. Thus the Prosopography is a research instrument of use both to the specialist and to all those just looking for rapid information on individuals, a region or a particular event.