Pseudo-Dionysius the Areopagite (or Dionysius the Pseudo-Areopagite) was a Greek author, 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. The author pseudepigraphically identifies himself in the corpus as "Dionysios", portraying himself as Dionysius the Areopagite, the Athenian convert of Paul the Apostle mentioned in Acts 17:34. Historic confusions In the early sixth century, a series of writings of a mystical nature, employing Neoplatonic language to elucidate Christian theological and mystical ideas, was ascribed to the Areopagite. They have long been recognized as pseudepigrapha, and their author is now called "Pseudo-Dionysius the Areopagite". Corpus Works The Corpus is today composed of: Divine Names (); Celestial Hierarchy (); Ecclesiastical Hierarchy (); Mystical Theology (), "a brief but powerful work that deals with negative or apophatic theology and in which theology becomes explicitly 'mystical' for the first time in history"; Ten epistles. Seven other works are mentioned repeatedly by pseudo-Dionysius in his surviving works, and are presumed either to be lost or to be fictional works mentioned by the Areopagite as a literary device to give the impression to his sixth-century readers of engaging with the surviving fragments of a much larger first-century corpus of writings. These seven other works are: Theological Outlines (), Symbolic Theology (), On Angelic Properties and Orders (), On the Just and Divine Judgement (), On the Soul (), On Intelligible and Sensible Beings, On the Divine Hymns. Dating In attempts to identify a date after which the corpus must have been composed, a number of features have been identified in Dionysius' writing, though the latter two are subject to scholarly debate. Firstly, and fairly certainly, it is clear that Dionysius adopted many of his ideas—including at times passages almost word for word—from Proclus, who died in 485, thus providing at the least a late fifth-century early limit to the dating of Dionysius. In the Ecclesiastical Hierarchy Dionysius twice seems to allude to the recitation of the Creed in the course of the liturgy (EH 3.2 and 3.III.7). It is often asserted that Peter the Fuller first mandated the inclusion of the Nicene Creed in the liturgy in 476, thus providing an earliest date for the composition of the Corpus. Bernard Capelle argues that it is far more likely that Timothy, patriarch of Constantinople, was responsible for this liturgical