Georgius Gemistus (Greek:Γεώργιος Γεμιστός; c.1355 – 1452/1454), later called Plethon (/ˈpliːθɒn, -θən/) or Pletho (/ˈpliːθoʊ/; Πλήθων), was a Greek scholar of Neoplatonic philosophy. He was one of the chief pioneers of the revival of Greek learning in Western Europe. In the dying years of the Byzantine Empire, he advocated a return to the Olympian gods of the ancient world.