"Justinian says that Morimus tried to hang himself with the diadem, evidently a ribbon-like bandeau, sent to him by Mithridates. The Roman royal diadem was originally a white ribbon, a wreath of laurel was the reward of distinguished citizens, while a circlet of golden leaves was given to successful generals. "Cæsar consistently refused the royal white diadem which Antony offered him, preferring to remain perpetual dictator. One of his partisans ventured to crown Cæsar's bust with a coronet of laurel tied with royal white ribbon, but the tribunes quickly removed it and heavily punished the perpetrator of the offence. "During the Roman Empire the prejudice against the white bandeau remained strong. The emperors dared not wear it. Caligula wished to do so, but was dissuaded on being told that such a proceeding might cost his life. Eliogabalus used to wear a diadem studded with precious stones, but it is not supposed to have indicated rank, but only to have been a rich lady's parure, this emperor being fond of dressing himself up as a woman. Caracalla, who took Alexander the Great as his model as far as possible, is shown on some of his coins wearing a diadem of a double row of pearls, a similar design to which was used by the kings of Parthia. On coins of Diocletian, there shows a double row of pearls, sewn on a double band and tied in a knot at the back. "Diadems gradually closed in and became crowns, and on Byzantine coins highly ornate diadems can be recognised, and there are many beautiful representations of them in enamels and mosaics, as well as a few actual specimens. At Ravenna, in mosaic work in the church of San Vitale, are crowned portraits of Justinian and his Empress Theodosia; in the enamel portrait of the Empress Irene in the Pal d'Oro at Venice, can be seen a beautiful jewelled crown with hinged plaques, and the same construction is used on the iron crown of Lombardy, the sacred crown of Hungary, and the crown of Charlemagne, all most beautiful specimens of jewellers' work. "On the plaques of the crown of Constantine Monomachos are also fine enamel portraits of himself and his queen Zoë, wearing similar crowns. The cataseistas, or jewelled chains, one over each ear and one at the back, which occur on all these crowns, may be the survival of the loose ends of the tie of the original fillet. {352} "In later times of Greece and Rome, owing to the growth of republican feeling the diadem lost its political significance, and was relegated to the ladies.