Since the 8th century three tonsures have been more or less in use, known respectively as the Roman, the Greek and the Celtic. The first two are sometimes distinguished as the tonsure of Peter and the tonsure of Paul.
To take off the top of anything, comes "crop" meaning a closely cut head of hair, found in the name "croppy" given to the Roundheads at the time of the Great Rebellion, to the Catholics in Ireland in 1688 by the Orangemen, probably with reference to the priests' tonsures, and to the Irish rebels of 1798, who cut their hair short in imitation of the French revolutionaries.
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