18th Century watercolor and ink on paper. Classical in style and Mythology in topic. Depicting Thetis plunging Achilles into the waters of the Styx. In a bid to make Achilles immortal like her, she dipped him in the River Styx, holding him by the heel. Achilles became almost immortal, apart from the tiny part of his heel that was untouched by the water, and it was this that would ultimately lead to his downfall.