The origins of Greek mythology are an open question. In antiquity, historians such as Herodotus theorized that the Greek gods had been stolen directly from the Egyptians. Later on, Christian writers tried to explain Hellenic paganism through degeneration of Biblical religion. According to the Scriptural theory, all mythological legends (including Greek mythology) are derived from the narratives of the Scriptures, though the real facts have been disguised and altered. Thus Deucalion is another name for Noah, Hercules for Samson, Arion for Jonah etc. According to the Historical Theory all the persons mentioned in mythology were once real human beings, and the legends relating to them are merely the additions of later times. Thus the story of Aeolus is supposed to have risen from the fact that Aeolus was the ruler of some islands in the Tyrrhenian Sea. The Allegorical theory supposes that all the ancient myths were allegorical and symbolical. According to the Physical theory the elements of air, fire, and water were originally the objects of religious adoration, and the principal deities were personifications of the powers of nature.