"How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!
      for thou hast said in thine heart,
           I will ascend into heaven,
             I will exalt my throne above the stars of God:
               I will sit also upon the mount of the congregation, in the    sides of the north:
                 I will ascend above the heights of the clouds;
                   I will be like the most High."  Isaiah 14:12-14

This Lucifer that Isaiah speaks of is none other than Satan.