The Sarcophagus of Adelphia: Detail, left end of the lid
Some scholars take this to be the Annunciation, others the decedent drawing from the well of Wisdom. The former is surely the more elegant of the interpretations, as it corresponds neatly to the narrative in the Protevangelium of James, where the "angel of the Lord" addresses Mary while she is out filling a pitcher with water. The woman bending at the well with a pitcher would be Mary, bareheaded because a virgin and wearing a simple belted tunic. At this early stage of iconography the angel behind her has no wings, like the angel in
this Sacrifice of Isaac panel
from a sarcophagus of the same century. The big head should be a personification of the well. Strange as it seems to modern perception, it was common for paleo-Christian images to represent a body of water both directly and by way of a bearded personification, as in
this Baptism of Jesus in Ravenna.
The alternative interpretation holds that the woman is the decedent, Adelphia herself, who in the next two scenes will be taken into the presence of Sophia, the personification of Wisdom. This first scene would have her drawing water from the well of Wisdom. The bearded man would be the "Ancient of Days," the name given to God in Daniel 7:9,13. This is the most strained aspect of the interpretation, because it does not give a satisfactory explanation for the standing male figure and in explaining the big head has to go outside the allegory to an obscure passage in scripture that is not evidenced in other sarcophagi. However, the two scenes to the right do support the Wisdom interpretation more satisfactorily.
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More of the Annunciation
Photographed at the Museo Pio Cristiano by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.