Ars Magna et Ultima
Calatan writer Lully's most important work, the "Ars Magna" or "The Great Art," was a defense of Christianity against the teaching of Abu-Al-Walid Muhammad Ibn-Ahmad Ibn-Rushd (1126-1198), commonly called Averroes. Averroes was a Muslim Spanish-Arab philosopher, jurist, and physician who held the heretical view that philosophy was as important as religion. Spain was in a heated battle over the Christian religion versus the invading Arab religions crossing over from North Africa. This was an founding factor in the Spanish Inquisition. Joseph Curwen kept a copy of Zetner's edition of this work in his collection.
("The Case of Charles Dexter Ward")
See also: Raymond Lully