In 1924, B. Russell claimed the crucial importance of relationships to our understanding of many unresolved philosophical problems. Such observation is more than fundamental for the contemporary philosophical agenda: ontology, philosophy of religion and several other theoretical fields require an explanation for the very nature of what a relationship is and how it works. Collecting several contributions on the very meaning of relations, the volume aims to expand the international debate in the field from a philosophical perspective. Ranging from history of philosophy to ontology, from philosophy of religion to the history of religious doctrines, leading scholars from all over the world come together to address this timely topic.