According to Wikipedia, at least the writings of Plato seem to have come to the west during the middle ages from byzantine (i.e. Greek) sources. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Plato#Textual_sources_and_history" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Plato#Textual_sources_and_hist...</a>