 Again the proper subject matter of physics is body inasmuch as it is movable. We have just looked at Avicenna’s conception of body and associated issues. I now turn to his theory of motion, followed by discussions of some of the conditions necessary for motion, like time and place. Avicenna’s theory of motion is best understood against the background of Aristotle’s account of motion and developments surrounding that account that emerged in the later Greek world. (For detailed discussions of Avicenna’s theory of motion see Hasnawi 2001; McGinnis 2006a; and Ahmed 2016). 