Mythology was the bed-rock of ancient religious and cultural norms. For example, different Greek communities had different gods. Athena was the goddess of Athens; Apollo was the god of Delphi, Hera of Argos and Demeter of Elesius. But Zeus was the king of the gods in the Greek mythology. In Egyptian, Babylonian, Scandinavian mythologies etc there are gods with different names, but who in their performances were more or less parallels or equivalents of the gods in Greek mythology.