A diadem was an ornamental headband, and later became a metal crown, worn by monarchs and others as a badge of royalty.
Coin of Antiochus III the Great of the Seleucid Empire, shown wearing a diadem, which was a type of headband tied around the head. Greek inscription reads ΒΑΣΙΛΕΩΣ ΑΝΤΙΟΧΟΥ, "of King Antiochus".
Gold and silver diadem of Philip II of Macedonia. This is one type of diadem used by Macedonian and Hellenistic rulers.
Gold diadem. Greek, probably made in Alexandria, Egypt, and belonging to a noblewoman of the Ptolemaic dynasty (220–100 BC): the clasp is shaped as a Herakles knot
Gold diadem. India, 9th–10th century
In ancient Greek religion, Hera is the goddess of marriage, women, and family, and the protector of women during childbirth. In Greek mythology, she is queen among the twelve Olympians on Mount Olympu
Diadem
…tiara). In some societies, it may be a wreath worn around the head. The ancient Persians wore a high and erect royal tiara encircled with a diadem. Hera, queen of the Greek gods, wore a golden crown called the diadem. The Persian, Greek and Macedonian traditions merged in the diadems of Alexander the…
The Campana Hera, a Roman copy of a Hellenistic original, from the Louvre
Hera on an antique fresco from Pompeii
The Temple of Hera at Agrigento, Magna Graecia.
Iris (on the left) with Zeus and Hera, east frieze of the Parthenon, British Museum.