Topic. The Corpus Vitrearum International (CVI) is an international coalition of projects engaged in the preservation, documentation, and study of stained glass. Based on a long tradition of producing printed volumes, participating projects also make data on stained-glass objects (or windows, in particular) available on the web. In this paper, we want to respond to a central question: how can a diverse and federated set of projects overcome the information silos that we built to improve access to their digital resources without centralisation? We present and discuss joint efforts across these projects to make their work more equitable starting from a position where, for example, rare books under contractual agreements with publishers, largely unstandardised object and image data, and national web repositories leave accessibility to be desired – in the sense of technological, language, and knowledge divides. After a brief look into the CVI’s past, the paper focuses on four measures to interconnect the data that participating projects provide and to make it more FAIR in the process: harmonising metadata by developing shared recommendations, investing into Linked Open Data (LOD) and connectable data points, engaging with the Culture Knowledge Graph project to interconnect fine-grained cultural-heritage data along with search and SPARQL interfaces, and modernising the repository software used to manage and publish data. This work is being done in the multidisciplinary environment of the CVI, whose members include art historians, DH, and other humanities scholars as well as restoration practitioners (cf. Frodl-Kraft passim).Conference DH Benelux 2024 , Leuven, Belgium, 4-7 June 2024 (Session 6, Part b).