Cultural heritage institutions such as museums, archives, or libraries are confronting a crescent necessity to integrate their system. For this reason, to make cultural resources accessible, it is necessary the use of rich metadata structures, capable to cover the variety of material held in these memory institutions. For those proposes, cultural heritage metadata mappings into an ontology is created to achieve interoperability among sundry digital cultural heritage repositories. The CIDOC Conceptual Reference Model (CRM) is used as the mediated schema to integrate Cultural Heritage metadata sources.