1 Kings 22:47

"There was then no king in Edom: a deputy was king."

Cross References (ranked by relevance)

So the king of Israel went, and the king of Judah, and the king of Edom: and they fetched a compass of seven days’ journey: and there was no water for the host, and for the cattle that followed them.

2 Samuel 8:14

And he put garrisons in Edom; throughout all Edom put he garrisons, and all they of Edom became David’s servants. And the LORD preserved David whithersoever he went.

2 Kings 8:20

In his days Edom revolted from under the hand of Judah, and made a king over themselves.

Genesis 27:40

And by thy sword shalt thou live, and shalt serve thy brother; and it shall come to pass when thou shalt have the dominion, that thou shalt break his yoke from off thy neck.

Genesis 25:23

And the LORD said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels; and the one people shall be stronger than the other people; and the elder shall serve the younger.