Name of St. Dionysius the Areopagite, a little known in the Romanian theology, first appears in 533, in a discussion between Chalcedonian Orthodox and Monophysites. The apostholic authority of this mysterious author was not known until then by the Orthodox. St. soon becomes theological authority, both Byzantine theology and for the scholastic. In his writings we find for the first time the notion of cataphatic and apophatic. In thinking of St. Dionysius the Areopagite there are several kinds of knowledge: human, angelic and divine.