Abstract
One of the great philosophical and theological debates in the second half of the thirteenth century concerned the metaphysical constitution of angels, namely whether they are, like trees and cats and humans, composed of "form" and "matter," in the sense given those terms by the then newly ascendant Aristotle.1 In this period, the field was roughly divided between universal hylomorphism, maintaining that angels are form/matter composites, and spiritual immaterialism, maintaining that spiritual beings such as angels are pure, self-subsistent forms. The former position was championed especially though not exclusively by Franciscan theologians (notably the "Seraphic Doctor," St. Bonaventure of...