Goliath
Goliath is a character in the biblical Book of Samuel, described 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 Israel. Scholars today believe that the original listed killer of Goliath was Elhanan, son of Jair, and that the authors of the Deuteronomic history changed the original text to credit the victory to the more famous character David. The phrase "David and Goliath" has taken on a more popular meaning denoting an underdog situation, a contest wherein a smaller, weaker opponent faces a much bigger, stronger adversary.
