Diadem

The word derives from the Greek διάδημα diádēma, "band" or "fillet",[1] from διαδέω diadéō, "I bind round", or "I fasten".

[2] The term originally referred to the embroidered white silk ribbon, ending in a knot and two fringed strips often draped over the shoulders, that surrounded the head of the king to denote his authority.

[4] A diadem is also a jewelled ornament in the shape of a half crown, worn by women and placed over the forehead (in this sense, also called tiara).

The "Priest King" statue made by the Indus Valley civilization (c.  3300 – c.  1300 BCE) wore a headband that is possibly a diadem.

The Roman emperor's head regalia worn, from the time of Diocletian onwards,[citation needed] is described as a diadem in the original sources.