This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Intaglio Caracalla Cdm Paris Chab. Portrait of Roman Emperor Caracalla inscription in Greek letters and cross added at the Byzantine period in order to transform the portrait in that of St Peter Amethyst intaglio ca CE From the treasury of the SainteChapelle in Paris Portrait de l'empereur Caracalla inscription en lettres grecques