The Pileus Hat was a common Headgear worn in Ancient Greece. They were made of felt-like material and were conical in shape. They were designed to be worn on The Crown of The Head, often canted rearward. Possibly seen and adapted from The Illyrians, The Pileus was also adapted into a Helmet known as The Pilos (5th Century BC). Rome later adopted The Pileus (with some modifications).