In Paradise Lost, Milton describes how Lucifer rebelled against God and was cast into Hell as a result. I've always wondered about the origin of this account since as far as I know, it's not mentioned anywhere in the Bible. Is it part of the Catholic creed (or the creed of any Christian denomination?) If so, what is the basis for it?
A partial answer may be found in Isaiah 14:12-15.
How you have fallen from heaven, morning star, son of the dawn! You have been cast down to the earth, you who once laid low the nations! You said in your heart, “I will ascend to the heavens; I will raise my throne above the stars of God; I will sit enthroned on the mount of assembly, on the utmost heights of Mount Zaphon. I will ascend above the tops of the clouds; I will make myself like the Most High.” But you are brought down to the realm of the dead, to the depths of the pit. (NIV)
Some interpret the fallen one as Lucifer, since in this passage he rebelled against God and attempted to set himself above God. He was cast down and thrown into the realm of the dead.