Abraham the patriarch lived in Gerar (an ancient city of the Pleshtim) for some period. Also, Isaac for a few years. [The land at that time was mostly Canaan, but those southern areas were settled by the Pleshtim. [[It coincides almost exactly with Gaza.] If you look on a map at where the archeologists discovered the site of that ancient city, it comes out at modern day Netivot. This explains the statement of Bava sali that Netivot is the "city of the Patriarchs." [Isaac was there for a few years, but had trouble with the shepherds of the Pleshtim, and eventually had to move (or wanted to move) to Beersheva. (He was okay with the king of the pleshtim, but decided at some point that that staying there was more trouble than what it was worth.)