Pandora
Olympian consistory
Consistory = council of cardinals. Rossetti uses Catholic church language for the Greek gods—they're a divine committee that made Pandora.
Four goddesses
Juno (marriage), Pallas/Athena (wisdom), Venus (love), Proserpine (death). Pandora got features from each—she's a composite woman made to destroy men.
ill-born things
The evils weren't created evil—they're 'good things turned to ill.' The gods perverted their own powers to fill the box.
Hope still pent
In Hesiod's myth, Hope stays trapped in the jar after Pandora releases all evils. Rossetti's brutal question: is Hope even alive in there?