City of the Dragon: Ljubljana

According to myths, Ljubljana was founded by Jason, the hero of Greek mythology who stole the golden fleece from King Aeëtes and then fled aboard the Argo with his comrades, the Argonauts, across the Black Sea and up the Danube and the Sava until they reached the Ljubljanica. There, they dismantled their ship to carry it overland to the Adriatic coast, where they rebuilt the vessel and set sail back to Greece. On their way to the coast, they stopped at a large lake in the marshes near the source of the Ljubljanica, where a dragon was said to dwell. Jason fought, defeated, and killed the monster.