Enneads
The Enneads (), fully The Six Enneads, is the collection of writings of Plotinus, edited and compiled by his student Porphyry (270). Plotinus was a student of Ammonius Saccas and they were founders of Neoplatonism. His work, through Augustine of Hippo, the Cappadocian Fathers, Pseudo-Dionysius the Areopagite and several subsequent Christian and Muslim thinkers, has greatly influenced Western and Near-Eastern thought. Contents. Porphyry edited the writings of Plotinus in fifty-four treatises, which vary greatly in length and number of chapters, mostly because he split original texts and joined others together to match this very number. Then, he  proceeded to set the fifty-four treatises in groups of nine (Greek. "ennea") or "Enneads". He also collected "The Enneads" into three volumes. The first volume contained the first three "Enneads" (I, II, III), the second volume has the "Fourth" (IV) and the "Fifth" (V) "Enneads", and the last volume was devoted to the remaining "Enneads". After correcting and naming each treatise, Porphyry wrote a biography of his master, "Life of Plotinus", intended to be an Introduction to the "Enneads". Porphyry's edition does not follow the chronological order in which "Enneads" were written (see "Chronological Listing" below), but responds  to a plan of study which leads the learner from subjects related to his own affairs to subjects concerning the uttermost principles of the universe. Although not exclusively, Porphyry writes in chapters 24-26 of the "Life of Plotinus" that the "First Ennead" deals with human or ethical topics, the "Second and Third Enneads " are mostly devoted to cosmological subjects or physical reality. The "Fourth" concerns the Soul, the "Fifth" knowledge and intelligible reality, and finally the "Sixth" covers Being and what is above it, the One or first principle of all. Citing the "Enneads". Since the publishing of a  modern critical edition of the Greek text by Paul Henry and Hans-Rudolf Schwyzer ("Plotini Opera". 3 volumes. Paris-Bruxelles, 1951–1973; H-S or "editio major" text) and the revised one ("Plotini Opera". 3 volumes. Oxford: Clarendon Press, 1964–1984; referred to as the H-S or "editio minor" text) there is an academic convention of citing the "Enneads" by first mentioning the number of "Ennead" (usually in Romans from I to VI), the number of treatise within each "Ennead" (in arabics from 1 to 9), the number of chapter (in arabics also), and the line(s) in one of the mentioned  editions. These numbers are divided by periods, commas, or blank spaces. E.g. For "Fourth Ennead" (IV), treatise number seven (7), chapter two (2), lines one to five (1-5), we write: E.g. The following three mean "Third Ennead" (III), treatise number five (5), chapter nine (9), line eight (8): It is important to remark that some translations or editions do not include the line numbers according to P. Henry and H.-R. Schwyzer's edition. In addition to this, the chronological order of the treatises is numbered between brackets or parentheses, and given below. E.g. For the previously given: Table of  contents. The names of treatises may differ according to translation. The numbers in square brackets before the individual works refer to the chronological order they were written according to Porphyry's "Life of Plotinus". Plotinus's Original Chronological Order. The chronological listing is given by Porphyry ("Life of Plotinus" 4–6). The first 21 treatises (through IV.1) had already been written when Porphyry met Plotinus, so they were not necessarily written in the order shown. In table format, the chronological order of Porphyry corresponding each of the Ennead treatises is: Note on the "Plotiniana Arabica" or "Arabic Plotinus". After the fall  of Western Roman Empire and during the period of the Byzantine Empire, the authorship of some Plotinus' texts became clouded. Many passages of "Enneads" IV-VI, now known as "Plotiniana Arabica", circulated among Islamic scholars (as Al-Kindi, Al-Farabi and Avicenna) under the name "The Theology of Aristotle" or quoted as ""Sayings of an old [wise] man"". The writings had a significant effect on Islamic philosophy, due to Islamic interest in Aristotle. A Latin version of the so-called "Theology" appeared in Europe in 1519. (Cf. O'Meara, "An Introduction to the Enneads". Oxford: 1995, 111ff.)