Archaeologists excavating the site of the biblical city of Ashkelon found what they say is the first and only Philistine cemetery ever discovered, and which may help resolve a debate about the Philistines’ geographical origins.

An archaeological discovery announced on Sunday in Israel may help solve an enduring biblical mystery: where did Goliath’s people, the ancient Philistines, come from?

There was very little biological trace of them until 2013, when archaeologists began excavating the site of the biblical city of Ashkelon.

Watch and find out what they discovered.