The Philistines were a Great People and Governed by Kings in the Patriarchal
Source: TTT
Genesis 21:22, 34
At that time Abimelech and Phicol the commander of his army said to Abraham, “God is with you in all that you do. / And Abraham resided in the land of the Philistines for a long time.
Genesis 26:8
When Isaac had been there a long time, Abimelech king of the Philistines looked down from the window and was surprised to see Isaac caressing his wife Rebekah.