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A diadem (from the Greek 'diadema' from 'diadeo' to bind round, or fasten) was originally a white ribbon, ending in a knot and two strips that were placed often on the shoulders, that surrounded the head of the king to denote his authority.
By extension, this term was applied later to a crown, generally with a circular shape. For example, the crown worn by the kings of Anglo-Saxon England were diadems, as was the crown of a baron later (in some countries surmounted by three globes).
A diadem is also a jewelled ornament worn by women with the shape of a half crown, placed over the forehead (in this sense, also called tiara). In some societies it is also a wreath worn around the head.