Lucifer is the Angel who led the rebellion against God. In fact, Lucifer is his Angel name, and he once sat at the right hand of God. But after his rebellion failed, he was cast down to hell, which he ruled as Satan.
The Book of Isaiah in the Bible states of his fall from grace, how art thou fallen from heaven, O Lucifer son of the morning! How art thou cut down to the ground, which didst weaken the nation.
He’s also referred to as the devil, Mephistopheles, the Prince of darkness, Moloch and the Antichrist.