Oxford theologian Alister McGrath has noted that "all medieval theology is ‘Augustinian’ to a greater or lesser extent." Augustine’s (354-430) influence shaped not only the Western Middle Ages, but it also influenced the Protestant reformers, who constantly referred to his teaching in their own debates. His teaching is “still one of the most potent elements in Western religious thought.” Therefore, to analyze what happened to premillennialism in the Middle Ages and the Reformation, it is necessary to observe the Augustinian foundation.