Greek underworld his duty was to bring these souls to the underworld and no one would persuade him to do otherwise. Cerberus (Kerberos), or the "Hell-Hound", is Hades' massive multi-headed (usually three-headed) dog with some descriptions stating that it also has a snake-headed tail and snake heads on its back and as its mane. Born from Echidna and Typhon, Cerberus guards the gate that serves as the entrance of the underworld. Cerberus' duty is to prevent dead people from leaving the underworld. Heracles once borrowed Cerberus as the final part of the Labours of Heracles. Orpheus once soothed it to sleep with
Dragons in Greek mythology where it became the constellation Draco. Dragons in Greek mythology Dragons play a significant role in Greek mythology. The word dragon derives from the Greek δράκων (drakōn) and its Latin cognate draco. Ancient Greeks applied the term to large, constricting snakes. Daniel Ogden speaks of three ways to explain the origins of Greek dragon myths: as "vertical" evolution from (reconstructed) Proto-Indo-European mythology, as "horizontal" adaptation from Ancient Near Eastern mythology, or as sitting within "the cloud of international folktale". Regarding theories of vertical transmission, Ogden argues that they carry "an unspoken assumption that prior to such a transfer the Greeks'