Bret Ripley wrote:There's no extra-biblical evidence for Abraham or, If I recall correctly, any biblical character prior to the first millennium bce. There is extra-biblical evidence for several of the kings (Hezekiah is a good example).
There are some interesting inscriptions that may or may not be relevant to biblical history. The Merneptah Stele (late 13th century bce) refers to 'Israel', but as inscription describes Egypt utterly destroying Israel, it isn't clear that this is a reference to the Bible's nation of Israel. The Tel Dan Stele (late 9th century bce) mentions 'bytdwd', which may be translated as 'House of David'.
The Tel Dan Stele is the earliest mention of any Biblical person that I am aware of. It's controversial because the inscription is fragmentary and doesn't say anything about David as a person, just that a person named seemed to have established a dynasty. I think it's logical to assume that this David is the same person as described in the Bible, but doesn't in any way establish the accounts of him in 1 & 2 Samuel.
You start getting lots of external evidence for Biblical figures that are in 1 & 2 Kings, with kings from the Northern Kingdom appearing before kings from the Southern Kingdom in the archaeological record. The best chronology puts this stuff in the 9th century BC.
But apart from people you do also start to see evidence for events and things mentioned in the Bible from the 9th century BC forward. Several battles mentioned have been found in the archaeological layer. Probably the most spectacular was the rediscovery of Hezekiah's water tunnel which ran underneath the city of Jerusalem. This was mentioned as part of Hezekiah's war preparations.