49 w - Translate

How are you fallen from heaven, O Heylel, son of the howling morning! how are you cut down to the ground, which did weaken the nations! For you have said in your heart, I will ascend into heaven, I will exalt my throne above the stars of El: I will sit also upon the Mount of the assembly, in the sides of the north: I will ascend above the heights of the clouds; I will be like El Elyon. Yet you shall be brought down to She'ol, to the sides of the pit. They that see you shall narrowly look upon you, and consider you, saying, Is this the man that made the earth to tremble, that did shake kingdoms; YESHA'YAHU (ISAIAH) 14:12-16 את CEPHER so can any one tell me who is this Lucifer people keep talking about??