The mitre is a western headdress with many forms. It is worn by bishops and abbots.
Both the western style of the miter and the Papal tiara stem from the ''camelaucum'' (Greek: [[Kamilavka|καμιλαύκιον]], ''kamilaukion''), which was originally a cap used by officials of the Imperial Byzantine court. "The tiara [from which the mitre originates] probably developed from the Phrygian cap, or frigium, a conical cap worn in the Greco-Roman world. In the 10th century the tiara was pictured on papal coins."<ref>
[[Britannica ]] 2004, ''tiara''</ref> Other sources claim the tiara developed the other way around, from the mitre. In the late Empire it developed into the closed type of Imperial crown used by Byzantine Emperors.
In Western Europe, the mitre was first used in ancient Rome by the [[Salii]] and other priests, and outside of Rome about the year 1000. Worn by a bishop, the mitre is depicted for the first time in two miniatures of the beginning of the eleventh century. The first written mention of it is found in a Bull of Pope Leo IX in the year 1049. By 1150 the use had spread to bishops throughout the West; by the 14th century the tiara was decorated with three crowns.
Nowadays, the miter is in most cases a pointed cap with two peaks: front and back. The early English or medieval style is short, of decorated or undecorated linen; the Roman style much taller, of rigid material.
500px|The evolution of the mitre ]]