In August 1474, the city of Basel, Switzerland, played host to one of the stranger judicial proceedings in European legal history: the criminal prosecution and execution of a rooster. The animal was accused of committing an unnatural act after townspeople allegedly witnessed it laying an egg. In medieval Europe, criminal trials against animals were surprisingly common, but the charge against this rooster carried severe supernatural implications.
Popular folklore held that an egg laid by a rooster, known as a cockatrice egg or basilisk egg, was inherently demonic. According to legend, if such an egg were incubated by a toad or a dog, it would hatch into a cockatrice—a terrifying mythical beast capable of killing humans with a single glance or breath. Panicked by the potential threat, local authorities arrested the fowl and appointed a legal defense advocate for the animal.
During the formal court proceedings, the prosecution argued that the rooster's act was contrary to divine natural order and posed a grave public hazard to Basel. The appointed defense attorney argued skillfully that the bird had no evil intent and that laying an egg was an involuntary biological anomaly rather than a conscious pact with Satan. Despite this defense, the magistrate declared the rooster guilty of committing an unnatural act.
On August 11, 1474, the bird was formally sentenced to death and burned at the stake in a public execution, along with the egg, before a crowd of curious onlookers to restore spiritual order.