Ephesians 6:12 warns Christians,
"For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this age, against spiritual hosts of wickedness in the heavenly places."

Daniel 10:13 refers to demonic fallen angels that are associated with kingdoms on this planet as kings of Persia.

Jesus referred to Satan as a king of an evil kingdom in Matthew 12:24-30.

The Bible calls Satan "the prince of the power of the air" in Ephesians 2:2 because he had great power over the earth since the fall of Adam and Eve.

Satan was present with the other "sons of God" at the moment of this world's creation.