One of the most mysterious and striking of medieval hairstyles was the tonsure (TON-shur). Beginning in the seventh and eighth centuries, members of Christian religious orders began to shave the top of their head in order to show their purity and chastity. The size and shape of the tonsure could vary. Some wore a semi-circle tonsure, others a full circle. Some shaved just above the ears and left a full head of hair below. In some Catholic orders monks shaved all but a narrow piece of hair, leaving a fringe that looked like a crown.
The origins of the tonsure are something of a mystery. Early Celts, a people based in northern Britain, were thought to have worn the tonsure prior to their contact with the Roman Empire (27 B.C.E. –476 C.E. ) and with no relation to religion. Members of both the Eastern Orthodox Church and the Roman Catholic Church wore the tonsure, and both claim that its origins go back to the time of Jesus Christ (c. 6 B.C.E. –c. 30 C.E. ). The tonsure was still worn by members of some Catholic religious orders until its abolition in 1972.
Cosgrave, Bronwyn. The Complete History of Costume and Fashion: From Ancient Egypt to the Present Day. New York: Checkmark Books, 2000.