Jonathan, son of king Saul and friend of young David, his story is told in The Book of Judges. Jonathan was a capable Israeli commander, who saved several hopeless situations in battle. His military luck arosed jealousy in his father. And after he saved David from his father’s attempt to kill him, Saul even thought that Jonathan considered treason and nearly killed his son instead. But Jonathan never left his father to join David’s outlaw band. He stayed with Saul when Philistine armies surged around Mount Gilboa. When David found out about their death he mourned for them both.
See: Cima da Conegliano. David and Jonathan.
Frederick Leighton. Jonathan's Token to David.
Rembrandt. Departing of David and Jonathan.