Cerberus was the three-headed watchdog that prevented the dead from escaping the Underworld. However, several heroes managed to overcome Cerberus using both intelligence and strength.

Cerberus: The Three-Headed Dog of Greek Mythology (Myths & Origins)

Medieval kings and figures in illuminated manuscript style

Horned figure with chain confronts young man

Achilles and Penthesilea, by Johann Heinrich Wilhelm Tischbein

Snow goggles and early Bayer aspirin bottle