Why was this made, and how was it used?
The Crusader Bible was made as a personal religious book for King Louis IX or as a gift for someone in his circle. The original manuscript had no text so the pictures alone would guide the viewer through the story. By looking at the illustrations, the viewer could contemplate the story, its connection to their life, and their own connection to God.
Outside its direct function, the Crusader Bible was also used to underscore King Louis IX's power and wealth. A manuscript the size of the Crusader Bible would have required the killing of upwards of 50 calves, an enormous expense even before labor and other materials are factored in. So King Louis's ability to purchase such a manuscript reflected on his own wealthy status. The content and style of the manuscript also highlight King Louis's political agenda. The scenes of the manuscript center the themes of power, leadership, and war. King Louis IX is linking himself to the powerful Biblical kings, particularly David.