This mid-18th-century Swedish oil painting depicts the ancient Greek hero, Hercules, slaying the serpentine dragon Ladon in the Garden of the Hesperides.It’s a remarkable piece and initially rather tricky to decipher due to its dark qualities. On the right, there’s cattle including a particularly vicious-looking bull. While on the left, we see a muscular figure grappling with a demonic dragon, which appears to be wrapped around a desolate tree.It relates to Hercules (or Heracles), the most revered of the Greek heroes, and his ‘twelve labours’, this being number eleven. The twelve labours were a series of perilous tasks undertaken in the service of King Eurystheus and its theme has often been portrayed by artists throughout the centuries.Labour eleven involved stealing three golden apples from the garden of the Hesperides, which was guarded by the hideous and fearsome serpent, Ladon. There are variations on how he achieved such a feat with one version involving a tense negot...