Nereus (The Old Man of the Sea), and Heracles depicted at the top of a black-figured lekythos, ca. 590-580 BCE by Istanbul Painter, now in the Louvre.

In Homer’s Iliad, Nereus presides over the Mediterranean Sea and is the grandfather of Achilles, through his mother, the sea nymph Thetis.
Source: Wikimedia Commons 

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