Being

Abstract

The chapter is divided into three main sections covering Kilwardby’s work on natural philosophy. The chapter starts with the basic issues of composition of corporeal substances and proceeds to consider the question of the nature of composition (versus simplicity) of the human soul. It also attempts to understand Kilwardby’s philosophical commitments underlying his involvement in the Oxford Prohibitions of 1277. Particular attention is paid to the notion of matter and simplicity that offers cues to the identification of the view(s) Kilwardby may be targeting in this event. In this chapter, I also show the nature of the events surrounding the 1277 Oxford Prohibitions in such a way that it makes clear that Kilwardby was not and could not be acting alone or even at his own initiative. Rather, the claim is that he was probably spearheading a philosophical and theological movement of opposition to certain interpretations of Aristotelian ideas, especially in natural philosophy. The final section of the chapter offers Kilwardby’s account of the nature of celestial change and the relation between celestial motion and time.