The Mycenaean Warrior Vase, found by Heinrich Schliemann on the acropolis of Mycenae, is one of the prominent treasures of the National Archaeological Museum, Athens. The Warrior Vase is probably the best-known piece of Late Helladic pottery, though its dating, to the 13th or 12th century BC, has been the subject of much discussion. It is a krater, a mixing bowl used for the dilution of wine with water, a custom which the ancient Greeks believed to be a sign of civilized behavior.