Goliath
Goliath is described in the biblical Book of Samuel as a Philistine giant defeated by the young David in single combat. The story signified Saul's unfitness to rule, as Saul himself should have fought for the Kingdom of Israel.
God Knows (novel)
All of the major touchstones of King David's life are in place: his childhood herding sheep, the prophet Samuel, Goliath, King Saul, Jonathan (and homosexual innuendoes), Bathsheba and Uriah, the Psalms, the treachery of Absalom, Solomon, etc.