The document summarizes the successes of the Europeana Libraries project. The project brought digital collections from leading research libraries to Europeana, including medieval manuscripts and early modern books. It established systems to ingest and index large quantities of digitized material, aggregating over 25 million pages of text. The project created a sustainable library aggregator service for Europeana and forged connections between research and national libraries at the European level. It served as a springboard for further collaborative projects.