The traditional local building materials of the Roman Republic, travertine, tufa and limestone were also employed for portraits in Rome and
in Italic cities during the Republican period. They seem, however, to have gone out of fashion for portraiture by the end of the Republic when
they were replaced by either marble or by the more dense limestone.
Limestone of varying quality was quarried throughout the Mediterranean
often on or very close to the habitation or cult site itself and it was used
extensively for portraiture, particularly in rural sanctuaries and tombs.
Unlike marble and bronze, limestone is not mentioned in inscriptions
as a material for honorific statues set up by the public. The silence in
the inscriptional evidence, however, may be because it was so prevalent
that it was considered ‘not worth mentioning’. However, there is evidence
that limestone was even used for representing the emperor in areas with
no marble resources. As different limestones have their own specific
character, local sculptors developed special skills and styles in carving
the stone, or they continued working in a tradition developed generations
before.

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