There are several explanations on the origin of the Ljubljana Dragon. According to a Slavic myth, the slaying of a dragon releases the waters and ensures the fertility of the earth, and it is thought that the myth is tied to the Ljubljana Marshes, the expansive marshy area that periodically threatens Ljubljana with flooding. According to the celebrated Greek legend, the Argonauts on their return home after having taken the Golden Fleece found a large lake surrounded by a marsh between the present-day towns of Vrhnika and Ljubljana. It was there that Jason struck down a monster. This monster has evolved into the dragon that today is present in the city coat of arms and flag.