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Themis was the personification of the concept of Justice.
Themis arranged to have Medusa brought to the Earth side of the river Styx to answer questions about Circe for Batman and Zatanna. She was glad to help too, since the Justice League had done so many good works in her name.
The depicted subject was never named on-screen, or otherwise. However, the name of the ancient Greek Goddess of Justice was Themis. The title of this article is conjecture based on Greek mythology.