from wikipedia. Even if you can show that it is wrong, this shows the idea is ubiquitous.http://en.wikipedia.org/wiki/Mitre
Eastern ChristianityThe most typical mitre in the Eastern Orthodox and Eastern Catholic churches is based on the closed Imperial crown of the late Byzantine Empire.
Therefore, it too is ultimately based on the older καμιλαύκιον although it diverged from the secular headdress at a much later date, after it had already undergone further development. It was not used by bishops until after the fall of Constantinople (1453).
The Eastern mitre is made in the shape of a bulbous crown, completely enclosed, and the material is of brocade, damask or cloth of gold. It may also be embroidered, and is often richly decorated with jewels. There are normally four icons attached to the mitre (often of Christ, the Theotokos, John the Baptist and the Cross), which the bishop may kiss before he puts it on. Eastern mitres are usually gold, but other liturgical colours may be used.
The mitre is topped by a cross, either made out of metal and standing upright, or embroidered in cloth and lying flat on the top. In Greek practice, the mitres of all bishops are topped with a standing cross. In the Russian tradition, only archbishops and higher will have the standing cross, all others will have the cross lying flat. Sometimes, instead of the flat cross, the mitre may have an icon on the top.
As an item of Imperial regalia, along with other such items as the sakkos (Imperial dalmatic) and epigonation, the mitre came to signify the temporal authority of bishops (especially that of the Patriarch of Constantinople) within the administration of the Rum millet (i.e., the Christian community) of the Ottoman Empire. The mitre is removed at certain solemn moments during the Divine Liturgy and other services, usually being removed and replaced by the protodeacon.
The use of the mitre is a prerogative of bishops, but it may be awarded to archpriests, protopresbyters and archimandrites. The priestly mitre is not surmounted by a cross, and is awarded at the discretion of a synod of bishops.