
Herakles and Poseidon
Herakles is usually shown with a lion skin and a club. The lion skin, λεοντή, comes from λέων (= lion) and refers to the Nemean Lion, which Herakles killed as one of his labours. His club is called ῥόπαλον. These are probably the easiest ways to recognise him.
Poseidon is a little more complicated. Hellenic gods were rarely associated with only one thing. Poseidon was connected with the sea, earthquakes, horses, and more, so he could appear with several different attributes.
Here, the strongest clue is the fish he is holding, probably a dolphin. The figure also has the familiar divine pose: a bare torso with a garment falling from the shoulder. This is especially common in representations of male gods. Goddesses, on the other hand, tend to be much more heavily clothed. Yes, even Aphrodite.
But what exactly is happening between Herakles and Poseidon?