But like other rulers of our own time, he was also obsessed with waging war in the East, mounting seven crusades, the last of which killed him. (In those days rulers did at least lead their own troops, and knew at first hand what carnage ensued, though that didn't put them off doing it over and over again.)
The Crusader Bible was designed to shore up Louis' reputation as a Christian crusader against the infidel, I.e. the Muslims. So every Old Testament story is shown in contemporary terms, with the Israelites depicted as Crusaders endlessly battling the Philistines, etc, etc. this makes it a remarkable record of 13th century life.
It's about to be rebound, and this means the library has been able, for the first time, to put 40 of the pictures on display. My favourites - a welcome relief from men fighting each other - were the ones showing the story of Ruth.
But looking at all of them again, I was struck by how each ideology and each side involved in violent conflict has confidently portrayed alien "others" in their own image, only an utterly mistaken or evil version, needing to be either wiped out or shown the right path, regardless of the deep cultural and historical gulfs between them.