Are you saying your evil creature claimed rulership over the earth?
Yes, absolutely. Adam was given dominion over the earth. People who rule over dominions are called kings. Or princes. When Adam obeyed the serpent and in the same act disobeyed God, he surrendered sovereignty. The devil became the prince of this world. When the devil offered sovereignty to Jesus, it was a real temptation. He cannot offer something he doesn't have. Jesus, the second Adam, through obedience gained back for mankind what Adam lost. This is affirmed in Daniel where it says that the kingdom will at some time in the future be given to the saints of the Most High.
When Satan appeared in the heavenly council, and was asked what he was doing there, his reply, from "walking up and down on the earth" was a boast of ownership. God didn't contradict him. However, God did point out that not everyone on earth was under his rule. Job, among others, both then and today, are exceptions. And while the earth is today legally owned by Christ, physical rule over the whole planet does not take place until "all His enemies are placed under His feet". That has yet to take place.