The systematic mapping of the interplay of ontology and epistemology in the context of present day philosophy of mathematics constitutes an important heuristic goal. In order to achieve it, we must analyze and reinterpret the position of mathematics in philosophy. The authors we have gathered to do so - philosophers, mathematicians and logicians from across Europ - share a significant expertise in the history and the methodology of science and mathematics. Their complementary perspectives bring to light insights and tools that pave the way for new philosophical conceptualisations of themathematical knowledge.