What important role does Lucifer play in the Dr Faustus? in 100 words.

Satan. "Lucifer" original meant Venus, referring to the planet's brilliance. In Christian lore, Lucifer is sometimes thought to be another name of Satan. Some traditions say that Lucifer was Satan's name before the fall, while the Fathers of the Catholic Church held that Lucifer was not Satan's proper name but a word showing the brilliance and beauty of his station before the fall. He appears at a few choice moments in Doctor Faustus, and Marlowe uses "Lucifer" as Satan's proper name. Lucifer serves as temptation for Faustus. Lucifer represents the eternal struggle between sin and Godly enlightenment.