  I present a discussion of some issues in the ontology of spacetime. After a
characterisation of the controversies among relationists, substantivalists,
eternalists, and presentists, I offer a new argument for rejecting presentism,
the doctrine that only present objects exist. Then, I outline and defend a form
of spacetime realism that I call event substantivalism. I propose an
ontological theory for the emergence of spacetime from more basic entities
(timeless and spaceless `events'). Finally, I argue that a relational theory of
pre-geometric entities can give rise to substantival spacetime in such a way
that relationism and substantivalism are not necessarily opposed positions, but
rather complementary. In an appendix I give axiomatic formulations of my
ontological views.

History and Philosophy of Physics;General Relativity and Quantum Cosmology