He was their lord, either,
1. By inheritance, as the issue of Elam, Shem's son, Genesis 10:22. Or,
2. By conquest, having subdued those people in a former war, which Josephus speaks of.
Related Commentaries of Genesis 14:4
Genesis 14:4
4 Twelve years they served Chedorlaomer, and in the thirteenth year they rebelled.