A diadem is a type of crown, specifically an ornamental headband worn by monarchs and others as a badge of royalty. The word derives from the Greek διάδημα diádēma, "band" or "fillet", from διαδέω diadéō, "I bind round", or "I fasten".
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. Such ribbons were also used to crown victorious athletes in important sports games in antiquity. It was later applied to a metal crown, generally in a circular or "fillet" shape. For example, the crown worn by Juliana 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 (Old Irish) as a diadem. Some of the earliest examples of these types of crowns can be found in ancient Egypt, from the simple fabric type to the more elaborate metallic type, and in the Aegean world.
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). 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.
By extension, "diadem" can be used generally for an emblem of regal power or dignity. The head regalia worn by Roman Emperors, from the time of Diocletian onwards, is described as a diadem in the original sources. It was this object that the Foederatus general Odoacer returned to Emperor Zeno (the Emperor of the Eastern Roman Empire) after his expulsion of the usurper Romulus Augustus from Rome in 476 CE.
The diadem or crown of Princess Sit-Hathor Yunet from her tomb. 12th Dynasty Egypt 19th century BC.
17th Dynasty diadem crown ancient Egypt (Rijksmuseum van Oudheden)
19th Dynasty wig with diadem (British Museum)
Elliptical diadem from Mycenae, Greece (16th century BC)
Diodotus of Bactria wearing the diadema, a white ribbon which was the Hellenistic symbol of kingship
The centerpiece of this Hellenistic diadem is a Herakles knot, known for its apotropaic powers and its status as a symbol of fertility. Walters Art Museum, ca. 3rd - 2nd century BCE.
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
Drachma of Mithridates I of Parthia, showing him wearing a beard and a royal diadem on his head
Greco-Roman bust of a woman wearing a diadem (100 BC-100 AD)
Imperial diadem as worn by Christian Roman emperors from the 4th century onward
Bracelet made from a diadem with the addition of two foliate elements (c. 1870, Walters Art Museum)
Ardashir I of Sassanian Persia wearing very elaborate diadems
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Types of crowns
العربية ديادم ▪ Беларуская Дыядэма ▪ Català Diadema ▪ Чӑвашла Диадема ▪ Čeština Diadém ▪ Dansk Diadem ▪ Deutsch Diadem ▪ Eesti Diadeem ▪ Español Diadema ▪ Esperanto Diademo ▪ Euskara Diadema ▪ فارسی دیهیم ▪ Français Diadème ▪ Galego Diadema ▪ Հայերեն Գլխազարդ ▪ Ido Diademo ▪ Italiano Diadema ▪ עברית עטרה (כתר) ▪ Lietuvių Diadema ▪ Nederlands Diadeem ▪ Norsk bokmål Diadem ▪ Polski Diadem ▪ Português Diadema (joia) ▪ Русский Диадема ▪ Shqip Diadema ▪ Српски / srpski Дијадема ▪ Srpskohrvatski / српскохрватски Dijadema ▪ Suomi Diadeemi ▪ Svenska Diadem ▪ Türkçe Diadem ▪ Українська Діадема ▪