Phocion was an Athenian statesman from the 4th century BC.

Phocion, an Athenian general, was falsely condemned and executed, and his unburied corpse banished, and taken to the outskirts of Megara where it was burnt.

And the outcasts are placed directly below the mighty nucleus of temple-rock-cloud.

But nothing in the scene indicates that the civilisation from which they're excluded is itself evil, corrupt or doomed, that they're well out of it.

"[1] The painting is housed at the Walker Art Gallery, part of the National Museums Liverpool, England.