Assertion: barberini ivory | /r/PartOf | diptych
Facets:
Source sentences:
text: It is not certain that the Barberini ivory belonged to a diptych, that is that there was a second set of plaques forming a second leaf with another portrait, perhaps of the empress – this first leaf is already too heavy to be comfortably used as a real writing tablet, and there is not trace of a hinge that could indicate it was a bookcover.[clarification needed]