Yes, indeed. Among the contributions of the Greek civilization is that inquiry into Being (ontos), hence ontology or metaphysics. They were first to ask that fundamental question in philosophy, ti to on, or "what is Being?". Even before Plato, the presocratics already managed to touch on the merit of this question but they were only focused on defining being as "urstoff", as the "fundamental stuff" that serve as origin of everything. Plato and Aristotle, however, provided a system that responded to this inquiry, one which we now call Platonism and Aristotelianism respectively. However, what I find interesting about Plato is the method by which he developed his system. He crafted first a narrative about a utopia. His metaphysical claims were then predicated on this agenda. To me, this method of expression is an art form on its own. Thanks for taking the time to give your insight, @sabjabal.