The eldest son of King Saul. He grew up during the transition from tribal loose-confederation to a unified kingdom. He was trained from birth to be the next king.
Before David ever appeared, Jonathan was the primary hero of Israel. With only his armor-bearer, he climbed a cliff and attacked a whole Philistine garrison, trusting that "nothing can hinder the Lord from saving." (1 Sam 14:6).
He was formed by Faith and Military Discipline. He was a master of the bow. He had a radical, simple trust in God that his father Saul lacked. He was the "ideal man" of the monarchy.