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The Paintings From Boscotrecase
A art history article on a series of wall paintings belonging to the "Third Style" found in a villa near Pompeii that may have belonged to the daughter of Augustus. There are five sections, the section entitled "The Painter in Roman Art"...
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Roman Painting: Frescoes From Campania
Gives detailed descriptions, classifications, and pictures of the various wall frescoes found in the Naples area of Italy during the period of ancient Rome. This includes the city of Pompeii.
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History of Painting: Greek and Roman Painting
This resource, although focusing more on Greek painting, contains some insight information on ancient Roman painting, primarily the Roman frescoes.