хмм, камилавка

[aleatorius]

A form of papal crown is first mentioned in the vita of Pope Constantine (eighth century) contained in the Liber Pontificalis; there it is called a camelaucum, a folded cap of white linen that was part of Byzantine court dress. A contemporary depiction of Gregory the Great (died 604) shows such a cap.
http://en.wikipedia.org/wiki/Origins_of_the_Papal_Tiara