  Dietrich did not devote any one specific work to an analysis of hierarchy. However, he makes extensive use of the notion in three treatises in particular: the De animatione caeli, the De visione beatifica, and the De intellectu et intelligibili. It is clear from reading these works as well as Dietrich’s other scientific and philosophical writings in which he established the nature of the metaphysical elements of esse, ens, entia, and quiditas that he concerned himself with what might be called the metaphysical structure of reality.