Satan. Lucifer. Beelzebub. Old Nick. Mephistopheles. The Prince of Darkness. Diablo. Rick Pitino?
All of the previous words are synonyms for the Devil; the adversary of God, Jesus, and the good of mankind. In Christian lore, Lucifer was one of God’s favored angels. He became jealous of God’s love for his new creation and their free will; that new creation happened to be humanity.
When Lucifer led an uprising against the Almighty, he was flung down into the bowels of the earth and was made to be the overlord of Hell, another dimension created specifically to torture and punish humans that committed the most grievous of sins.