David, an Israelite, defeated Goliath, a Philistine giant, in single combat in one of the most famous episodes of the Bible.

With little evidence to support the legend, its origins have proved mysterious – yet now a new discovery could shed light on the tale.

Archaeologists excavating Goliath's hometown, Gath, have unearthed a new layer of ruins dating back to the time of the biblical battle – and they're unusually large.

Excavation director Aren Maeir, of Bar Ilan University in Israel, said the discovery came as a surprise after 23 years.

He said: "We now know the size and impressive nature of the early Iron Age city is quite different than previously thought.

"It was assumed the city reached its large size during the 10th and 9th century BC.

"It now appears that the early Iron Age city – 11th century BC and perhaps before – may have been even bigger and more impressive.