In my first post about Demetrius of Cyzicus (fl. ca. 1028) I wrote that the Greek work against the Jacobites etc.,…
… was composed between 1026-28 by the deeply obscure Demetrius, Metropolitan of Cyzicus. What little is known about him can apparently be found in H.G. Beck, Kirche und theologische Literatur im Byzantinischen Reich (Munich, 1959), p.532, although I have not looked.
Well, I have now located this volume, and others, and I find that I was misled by my reference, and rather more is known. But anyway, let’s start with the Beck paragraph, and then give a ChatGPT translation of it.
Ein Günstling des Kaisers Konstantinos VIII. und besonders des Kaisers Romanos Argyros war der Metropolit von Kyzikos, Demetrios. 1028 ist er durch seine Unterschrift unter ein Synodaldekret bezeugt. 1037 ließ er sich ohne Glück in eine Konspiration gegen den Patriarchen ein. Wahrscheinlich ist er der Verfasser einer „Ἔκθέσις κατ’ ἐπιτομὴν τοῦ τῶν Ἰακωβιτῶν δόγματος“, die er im Auftrag des Kaisers Konstantinos verfaßt haben will und ihm widmet. In addition to the Traktates you can read, you will be able to leave them in a very thick place. Mit der vieldiskutierten Narratio de rebus Armeniae hat der Traktat nichts zu tun, ebensowenig Demetrios mit der Abfassung der einem Isaak zugeschriebenen Invektiven gegen die Armenier (S. 533 u. 628). If these are the versions of literary products in which they are published, they are included in the unglücklichen bibliographischen Umständen zu verdanken.
Demetrios is also the Kanonist hervorgetreten. Wir kennen eine Μελέτη über die Verwandtschaftsgrade und einen kanonischen Bescheid über einen Sonderfall der Verwandtschaftsgrade. Fünf, vielleicht sechs Logoi über verschiedene juristische Fragen sind noch unediert.²
- Gegen die Jakobiten: PG 127, 878–885 (unter dem Namen des Philippos Monotropos), der fehlende Anfang und Schluß: G. Ficker, Die Erlasse des Patriarchen Alexios Studites, Kiel 1911, 22–23; – die μελέτη: PG 119, 1097–1116 and Rhalles-Potles V 354–366; – Bescheid: PG 111, 1116–1120 and Rhalles-Potles V 366–368.
² Ehrhard 79, 1. 89; – DTC IV 264–265 (L. Petit); – LTK III 202 (A. Michel); – DHGE XIV 208–210 (J. Darrouzès); – G. Garitte, Narratio de rebus Armeniae, Louvain 1952 (im Kommentar ausführliche Diskussion des gesamten Zuteilungsproblems mit kritischer Sichtung der Literatur).
Running this through ChatGPT gives us:
A favourite of the emperor Constantine VIII, and especially of the emperor Romanos Argyros, was Demetrius, metropolitan of Cyzicus. In 1028 he is attested by his signature on a synodal decree. In 1037 he became involved, unsuccessfully, in a conspiracy against the patriarch.
He is probably the author of an “Abbreviated Exposition of the Doctrine of the Jacobites,” which he claims to have composed at the commission of the emperor Constantine and dedicated to him. From the conclusion of the treatise it emerges that he had already previously delivered an opinion on the same subject. Note that the treatise has nothing to do with the much-discussed Narratio de rebus Armeniae , nor does Demetrius have anything to do with the composition of the invectives against the Armenians attributed to Isaac (pp. 533 and 628). The fact that these three different literary works were brought into connection with one another is due solely to unfortunate bibliographical circumstances.
Demetrius also distinguished himself as a canonist. We know of a Meletē (=study/treatise) on degrees of kinship, and of a canonical ruling concerning a special case involving degrees of kinship. Five, perhaps six, logoi (=discourses) concerning various legal questions are still unpublished.²
- Against the Jacobites : PG 127, 878–885 (under the name of Philippos Monotropos); missing the beginning and ending: G. Ficker, The Decrees of Patriarch Alexios Studites , Kiel 1911, 22–23; the meletē : PG 119, 1097–1116 and Rhalles–Potles V 354–366; the canonical ruling: PG 111, 1116–1120 and Rhalles–Potles V 366–368.
² Ehrhard 79, 1. 89; DTC IV 264–265 (L. Petit); LTK III 202 (A. Michel); DHGE XIV 208–210 (J. Darrouzès); G. Garitte, Narratio de rebus Armeniae , Louvain 1952 (with a detailed discussion in the commentary of the entire problem of attribution, with a critical review of the literature).
Note that the abbreviations in the above are:
- DHGE = Dictionary of Ecclesiastical History and Geography, Paris, 1912.
- DTC = Dictionary of Catholic Theology, Paris, 1932 ff.
- Ehrhard = A. Ehrhard, Theologie, in: K. Krumbacher, Geschichte der byzantinischen Literature, 2. Aufl., München, 1897 , 37-218.
- LTK = Lexikon für Theologie und Kirche, Freiburg, 1930 ff.
- Rhalles–Potles = K. Rhalles-M. Potles, Σύνταγμα τῶν θείων καὶ ιἑρῶν κανόνων , I-VI, Athens 1852-1859.
This article is a start. It is shorter than it needs to be, as is perhaps inevitable in so wide a survey of authors. It clearly draws upon the old DGHE article which goes into much more detail. It is also notable for the sheer age of the material referenced, even allowing that Beck’s article itself is now seventy years old. The vague “bibliographical circumstances” are simply the accident that the three texts all appeared one after another in one manuscript and the first editor ascribed them all to Demetrius.
A kind commenter drew my attention to an interesting article by Zachary Chitwood in GRBS 54 (2014) (online here, pp.300-301) which manages to cover a lot of the background to Demetrius’ anti-Jacobite text in a footnote:
The introductory and closing paragraphs of the text are printed in Ficker, Erlasse 22–23, while the rest of the text corresponds to PG 127.880–884. The text printed in PG is erroneously ascribed to “Philippus Solitarius” instead of Demetrios of Kyzikos (the likely author); see Dagron, TravMém 6 (1976) 201 n.108; Ficker, Erlasse 23; an analysis of the text and a German translation in Benner, Die syrisch-jakobitische Kirche 123–136.
Abbreviations again: TravMém = G. Dagron, Travaux et Mémoires. Ficker = G. Ficker, Erlasse des Patriarchen von Konstantinopel Alexios Studites (Kiel 1911). The Benner item is a thesis, from 1990, which exists in PDF but curiously is not on Academia or somewhere like that.
So we now know something.



