Diadem

A diadem is a type of crown, specifically an ornamental headband worn by Eastern monarchs and others as a badge of royalty.The term originally referred to a white ribbon, ending in a knot and two strips often placed on the shoulders, that surrounded the head of the king to denote his authority. It was applied later to a crown, generally in a circular shape. For example, the crown worn by the kings of Anglo-Saxon England was a diadem, as was that of a baron later (in some countries surmounted by three globes). The ancient Celts were believed to have used a thin semioval gold plate called a mind as a diadem.