I am enjoying reading of the complex relationship between Saul and David.
Dramatic rendering by Gustave Dore’ in #9. Love it.
Now that you've mentioned it, I considered it and realized that David faced several serious foes: Goliath, Saul, Absolom, and God, plus all the opposing armies. Further, the Bible details his struggles in more depth than anyone other than perhaps Joseph, Job, Daniel, Jesus and Paul.
Doré's immense talent, imagination, intelligence, craftsmanship and persistence are always obvious, but never moreso than in the one you cited.