This woman's coiffure is the feature that most easily places her within the chronology of Roman Imperial portraiture. The large bun and center-parted hair was made popular in the Late Antonine Period by Faustina the Younger, daughter of the Emperor Antoninus Pius and wife of the Emperor Marcus Aurelius. See, for example the portrait in Paris, no. 108, pp. 244-245 in de Kersauson, Catalogue des portraits romains, Tome II. The style was revived toward the end of the century on portraiture of Didia Clara and Manlia Scantilla, the daughter and wife of the Emperor Didius Julianus, who reigned for 66 days in 193 A.D. See also the relief of a man and a woman as Venus and Mars now in the Villa Albani, fig. 317, p. 349 in Kleiner, Roman Sculpture. This portrait likely falls into the revival period for the coiffure.