The thirteenth century brought new urgency to Catholic efforts to convert non-Christians, and no Catholic ruler was more dedicated to this undertaking than King Louis IX of France. His military expeditions against Islam are well documented, but there was also a peaceful side to his encounter with the Muslim world, one that has received little atten "Jordan carefully tracks down and puts together the records of the crown's financial outlays and legal and administrative measures for these immigrant converts. This painstaking detective work provides a fascinating study that will be of great interest to historians of the crusade and of the French crown."---John Tolan, Journal of Ecclesiastical History