There are four main styles of Roman wall painting that have been found: Incrustation, architectural, ornamental, and intricate. Each style is unique, but each style following the first, contains aspects of each style previous to it. Any original paintings were created before the eruption of Mount Vesuvius. The first two styles (incrustation and architectural) were a part of the Republican period (related to Hellenistic Greek wall painting) and the last two styles (ornamental and intricate) were a part of the Imperial period.