Panentheism is among the most influential variations on classical theism found within nineteenth and twentieth century theology, a prominent perspective in the recent religion and science dialogue, and is increasing in prominence within analytic philosophy of religion. Existing works on the history of panentheism understandably focus primarily on proponents of the view and their arguments in its favor. Less attention has been given to the history of arguments against it, and in particular little has been written on mediaeval Scholastic critiques. (...) Here, I summarize the criticisms leveled by an important thirteenth-century Franciscan, Alexander of Hales. I also assess the enduring value of his critique, arguing that it helps bring to the fore the importance of panentheism’s link with a further metaphysical debate: that between spacetime relationism versus substantivalism. (shrink)