Isa 14: Canaanite mythology
    "There was [a] text... concerning 'Baal and Anat' with which
    Isaiah must have been familiar. The story at this point concerns finding a
    replacement for Baal who has just died at the hands of Mot, the god of sterility
    and the dead. It is suggested that Athtar succeed to the throne of Baal but he
    soon proves to be inadequate and has to step down to become god of the
    underworld. The text is as follows:
    
    
        'Then Athtar the Awesome climbed Mount Zaphon,
        Ascended the throne of Ba'al the Almighty.
        But his feet did not reach the footstool,
        His head did not touch the headrest.
        Then, Athar the Awesome spoke,
        . . . . .
        'I cannot serve as king,
        I cannot dwell on the heights of Zaphon!'
        So, Athtar the Awesome descended,
        Stepped down from the throne of Ba'al the Almighty.
        He became king of the Underworld,
        Lord of the River of the Dead.'
        (Victor Matthews, Don Benjamin, Old Testament Parallels
        166).
    There are some striking similarities between this text and Isa
    14:12-15... a couple of strong parallels which more then suggest that Isaiah
    knew this Canaanite myth and was using it as part of his taunting proverb about
    the king of Babylon: 
    
    
        - Both texts mention ascending to an exalted throne.
        
 - Isaiah mentions the
            "sides of the north" which is the Hebrew word "zaphon" and this is used in the
            Canaanite text as Mount Zaphon.
        
 - Isaiah mentions hell (Heb sheol) and the pit
            (Heb bowr) while the Canaanite text talks about the Underworld.
        
 - Isaiah
            mentions Lucifer (Heb Helel) which means the morning star or Venus: the
            Canaanite god Ashtar or Athtar is associated with Venus. ["Before the sun
            revolves, a very large star named Venus, which varies its course alternatively,
            and whose alternative names in themselves indicate its rivalry with the sun and
            moon -- when in advance and rising before dawn it receives the name of Lucifer,
            and being another sun and bringing the dawn, whereas when it shines after sunset
            it is named Vesper, as prolonging the daylight, or as being deputy for the
            moon..." -- Pliny the Elder, Historia Naturalis. "In the seasonal Canaanite rite
            of the dying god, "a substitute is sought for Ba'al in his eclipse, and Athtar
            the Fierce, originally the god manifest in the bright Venus star and secondarily
            associated with vegetation, is proposed since his brightness might be thought to
            qualify him for the place of Ba'al, whose potent advent is signalized in
            lightning. But the attempt is abortive" -- John Gray, Near Eastern
            Mythology.]
        
 - Isaiah mentions that Lucifer is the "son of the morning." The
            Canaanites also had a god named Shachar which means 'Dawn' and he was the father
            of Athtar. Therefore Athtar (Lucifer) was literally a son of Shachar (Morning)
            to the Canaanites.
    
 
    Isaiah is using the Canaanite myth of Athtar's inability to
    reign in Baal's place and he is using it to deride the King of Babylon. The
    links are undeniable and it is a wonderful twist of this false religion to use
    it as a taunt." (TY)