Santorini exploded about 1500 B.C. That prompted the invasion of the eastern Mediterranean by the Sea Peoples. These were the survivors of Knossos. They knew how to smelt iron. Among them were the Philistines. They first tried to conquer Egypt. They failed and settled near Gaza. There is no mention of the Philistines in the Bible at the time of the Patriarchs, but the Philistines are in the land at the time of the Exodus in the 1400s B.C.
The Philistines and Abimelech, one of their kings, is mentioned a number of times in Genesis (21:29, 21:32, 21:34, 26:1, 26:8, 26:14, 26:15, 26:18, KJV) in connection with Abraham and Isaac.