 Along with their father Heracles, they possibly were the guardians of Mount Olympus, and the pair may have been regarded as the gatekeepers of Olympus, a role which was often assigned to their immortal father.Additionally, they were likely responsible for the protection and fortification of towns and citadels.They were born after the hero's mortal death and ascent to Olympus, where he gained immortality and married the goddess Hebe.