The Book of the Order of Chivalry was written in Catalan by Ramon Llull between 1274 and 1276 and is one of the author’s earliest works. After his death, it achieved a wide dissemination throughout Europe in part because it was considered the theoretical manual on knighthood par excellence. The book was written in Catalan for knights who might not have a knowledge of Latin. Llull devotes his treatise to the definition of the duties of a perfect knight. In addition, he is interested in delving into the religious and moral aspects of chivalry as well as in trying to reform this institution. This edition is based on the Catalan text from Luanco’s Libro de la Orden de Caballería del B. Raimundo Lulio, which is included here in facsimile format thanks to the generosity of the Reial Acadèmia de Bones Lletres de Barcelona. To this are added new Spanish and contemporary English translations. In addition, this volume includes an edition of Caxton’s 16th century English translation.