Isaiah 14:12 - Ellicott's Commentary On The Whole Bible

How art thou fallen from heaven, O Lucifer, son of the morning! — The word for Lucifer is, literally, the shining one, the planet Venus, the morning star, the son of the dawn, as the symbol of the Babylonian power, which was so closely identified with astrolatry. “Lucifer” etymologically gives the same meaning, and is used by Latin poets (Tibull. i., 10, 62) for Venus, as an equivalent for the phôsphoros of the Greeks. The use of the word, however, in mediæval Latin as a name of Satan, whose fall was supposed to be shadowed forth in this and the following verse, makes its selection here singularly unfortunate. Few English readers realise the fact that it is the king of Babylon, and not the devil, who is addressed as Lucifer. While this has been the history of the Latin word, its Greek and English equivalents have risen to a higher place, and the “morning star” has become a name of the Christ (Revelation 22:16).