To the right:
"She is Arethusa loved by Alpheyos, then the mosaic before is Alpheyos in relation to this myth.

An ancient myth, handed down to us by Ovid in his "Metamorphoses", states that the nymph Arethusa fled from the Greek river-god Alpheios, fell into the sea on the east coast of the Peloponnese and surfaced again on Ortygia in the old town of Syracuse. "