Fire-breathing, winged monsters, European dragons are pictured as living in underground lairs or rivers. They were thought to guard valuable riches and were frequently associated with heroes who attempted to kill them. For example, there’s the all-too-familiar story of Saint George, the venerated warrior saint, slaying a dragon. As a result, dragons are associated with sin, wickedness, and ferocity in European mythology. However, there are some prominent exceptions to this idea in Welsh tradition.