The pileus (Greek πῖλος - pilos, also pilleus or pilleum in Latin) was a brimless, felt cap worn in Ancient Greece and surrounding regions, later also introduced in Ancient Rome. The Greek πιλίδιον (pilidion) and Latin pilleolus were smaller versions, similar to a skullcap.

The pileus (Greek πῖλος - pilos, also pilleus or pilleum in Latin) was a brimless, felt cap worn in Ancient Greece and surrounding regions, later also introduced in Ancient Rome. The Greek πιλίδιον (pilidion) and Latin pilleolus were smaller versions, similar to a skullcap.