"Paula gave me a St Christopher's medal"
Woodcut of St Christopher
Public DomainWoodcut of St Christopher - Credit: Anonymous

Saint Christopher, martyred in the third century by the Roman Emperor Decius, is revered by both Roman Catholics and Orthodox Christians.  It is said that Christopher once carried a small child across a swollen river; during the crossing the child grew impossibly heavy, and he later revealed himself to be Christ.

 

An image of Saint Christopher, such as is worn or is placed in a vehicle, for protection on long journeys
Creative Commons Attribution Share AlikeAn image of Saint Christopher, such as is worn or placed in a vehicle, for protection on long journeys - Credit: Andreas -horn- Hornig

 

Medals of the saint, depicting his name and image, are said to bring travellers protection.