Isaiah 14:12-14 provides the first clear piece of evidence that Lucifer ruled Earth as a king before the days of Adam. This passage covers a period in Lucifer's history when he ruled, and then was defeated, so it had to be a time before Adam was created, because God gave Adam dominion over the Earth, not Lucifer. It wasn't until after Adam was created and deceived by Lucifer that Lucifer, who was then known as Satan, was able to regain dominion of Earth as the prince of this world, as he is today-but not indefinitely.

To understand this passage, something called the law of double reference comes into play, because the passage alludes to both Satan and the king of Babylon. The king of Babylon is the visible person who is immediately addressed in Isaiah 14:4, and Satan, who is also addressed in Isaiah 14:12-14, is the invisible entity who is using the visible person as a tool to hinder the plan of God. Isaiah 14:12-14 makes statements that obviously don't apply to the king of Babylon, even though he is the one who is initially addressed. The statements directed toward Satan are those that I will now highlight.

Isaiah 14:12-14
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 your 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.

These statements tell us a great deal about Lucifer's fall from glory, which had to happen at a time that predates Adam and Eve. First Lucifer was a king, because he had a throne; this also implies that he had subjects over whom he ruled. Isaiah also states that he weakened nations, which had to be composed of other nonhuman living beings (angels and those who had not become angels yet), because Adam and Eve weren't created yet during the time that Lucifer was a sinless being ruling as a king. (I say these beings were nonhuman, but that's not entirely accurate; they weren't quite the same as Homo sapiens today, but they were very similar?keep reading).

Of most concern to Earth's ancient history is the fact that Lucifer's kingdom was on Earth. If this were not the case, he never could have ascended above the clouds, stars, and into the highest heaven. When a kingdom is located under the clouds, it has to be on a planet, and the Bible only alludes to other planets indirectly as being celestial spheres in the heavens. If Satan were in the heavens already when he began his invasion into the highest heaven where God's throne is, then he would've already been among the stars from Isaiah's perspective, rather than under the clouds. How could he be in the heavens if he was under the clouds? His ascension above the clouds, and then to the stars, naturally implies that his point of origin was Earth.