The meeting focused on the development and use of digital tools for the presentation and analysis of historical data. The discussion was opened by the researchers of the DARIAH-GR/DYAS and APOLLONIS group, who presented the rationale for the organization of the infrastructure, the analysis of the responses to the relevant questionnaire sent to the qualified users, and the parallel digital platform for the 1940s that is being developed the APOLLONIS. Presentations were made by representatives of Greek libraries and archival, museum and research bodies (National Library, Humanities Research Center, General Archives of the State, Gennadeios Library, National Historical Museum, Institute of Mediterranean Studies). In this context, various projects and actions were presented for the organized and interoperable presentation of digitized historical material about 1821, but also for the creation of an open digital archive about the Revolution with the title "Digital Archive 1821" by the KEAE. The discussion was enriched by the contributions of historians who use digital tools in the development of research programs of the University of Athens and the National Research Foundation, as well as academicians who creatively use digitized historical sources in teaching. The aim of the working meeting was the cross-discussion of opinions and the development of common reflections on the possibilities that the semantic interoperability of digitized material can offer to researchers as well as its accessibility through the targeted creation of digital services and tools. The particularly fruitful results of the meeting will be utilized in the completion of the study for the creation of the digital infrastructure.