Pseudo-Dionysius the Areopagite, Dionysius the Pseudo-Areopagite or Pseudo-Denys is the pseudonymous name used by a Syrian or Greek monk, Christian theologian and Neoplatonic philosopher of the late 5th to early 6th century, who wrote a set of works known as the Corpus Areopagiticum or Corpus Dionysiacum. Through his writing in Mystical Theology, he has been identified as the "progenitor of apophatic or negative theology." c. 500 – c. 600; died at about 100. Alive at the same time as Muhammad, Umar ibn Al-Khattāb, Brahmagupta, Alī ibn Abī Ṭālib, and Abu Bakr. Wiki link