Ancient city, eastern Peloponnese, southern Greece. Inhabited from Neolithic times, it developed as an important Mycenaean centre in the Bronze Age, reaching its height c. 1400 BC. It declined as Argos grew in power after 1100 BC. The Argives destroyed it c. 468 BC. Ruins of its palace and massive walls date from the 15th–12th centuries BC. The term cyclopean masonry derives from the huge stones used in its construction, supposedly by the Cyclops for Proteus. The city is also connected with Perseus and Heracles.