 In (i) the discussion about the unity of matter arises from the questions of whether spiritual beings have matter and whether this matter is in some way common to the matter of corporeal beings (univocally, i.e., whether it is matter in the same sense) (QLIIS 14–16; DOS, chapters 29–31). According to its editor, Albert Judy, DOS 31 is probably the result of a public disputation on the topic by Kilwardby or one that he attended and is here reporting. What is clear in any case is the relation between the views presented in this chapter and those of some of Kilwardby’s contemporaries, such as Roger Bacon, Albert the Great, and Bonaventure (see also Donati 2013). The nature of matter is of particular significance due to the role it played in the Prohibitions, with a number of articles being about the nature of privation, prime matter, body, and active potencies in matter (Silva 2020, chapter 2).