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In page Portland Vase:

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The bottom of the vase was a cameo glass disc, also in blue and white, showing a head, presumed to be of Paris or Priam based on the Phrygian cap it wears. This roundel[citation needed] clearly does not belong to the vase and has been displayed separately since 1845. It may have been added in antiquity or later, or is the result of a conversion from an original amphora form (paralleled by a similar blue-glass cameo vessel from Pompeii). It was attached to the bottom from at least 1826.