while fighting with Hercules the river-god Achelous changes himself into a serpent

Hercules vecht tegen de riviergod Achelus

Heinrich Aldegrever (mentioned on object), 1550

Hercules in gevecht met Acheloüs

Simon Frisius, 1610 - 1664

Hercules worstelt met Acheloüs

Giulio Bonasone (mentioned on object), 1501 - 1580