In my previous post about this obscure 11th century Byzantine bishop, I gave the 1959 entry by Beck. This drew upon and abbreviated the old French (1912!) DHGE (Dictionary of Ecclesiastical History and Geography) article.
Many volumes of the DHGE are online somewhere. I know this because I have a directory full of volumes. But I was unable to find a link now. Since it is out of copyright, but inaccessible, I thought that I would make it available here. I will put the original French in a footnote.[ref]5. DEMETRIUS DE CYZIQUE. — Rien n’oblige à admettre l’existence de deux Démétrius de Cyzique ni à distinguer le polémiste du canoniste; il faut s’en tenir à Lequien, Oriens Christianus, 11, 758. Le seul argument énoncé par L. Petit, dans le D. T. C., en faveur de l’existence du premier, au Xe s., est l’adresse qui précède l’opuscule sur les jacobites, écrit à la demande de Constantin Porphyrogénète (P. G., cxxvii, 879-902). Or ce Porphyrogénète ne s’identifie pas nécessairement avec Constantin VII (944-59); son petit-fils, frère et successeur de Basile II, Constantin VIII (1025-28), avait bien plus de raisons de consulter un ecclésiastique sur les jacobites que son grand-père, suffisamment érudit. D’autre part, sous le règne effectif de Constantin VII, il n’y a pas de place pour un Démétrius sur le siège de Cyzique, occupé sans interruption par Théodore. En effet, avant 946, date de la mort d’Anastase d’Héraclée (Theoph. Cont., éd. Bonn, 439; S. Runciman, Romanus Lecapenus, 235), Théodore de Cyzique, en compagnie d’Anastase, est membre d’une commission chargée d’enquéter sur Alexandre de Nicée : ms. Patm. 706, fol. 104. En 956, le méme Théodore se signale par son opposition à Polyeucte et, en 959, Constantin Porphyrogénète vient le voir A l’Olympe peu avant de mourir (Cedrenus, II, 335, 337).
Petit semble avoir révisé son opinion catégorique exposée à l’article Démétrius, car à l’article Isaac l’Arménien (D. T. C., viii, 13), il attribue l’exposé des erreurs arméniennes au métropolite vivant sous Alexis Studite (1025-46). En tout cas il faut bien distinguer cet opuscule De Jacobitis et Chatzizariis de la Narratio de rebus Armeniae, dont G. Garitte vient d’élucider les origines : ce qui est certain c’est que celle-ci n’a rien à voir avec Démétrius de Cyzique, sinon accidentellement par la faute des copistes et surtout des éditeurs postérieurs à Combefis. Aux mss. du De Jacobitis indiqués par L. Petit: Athous 927, 3666, 3758, 4501, Palatinus 356, Scorialensis R I 15, Constantinopolitanus S. Sepulcri 391, Mosquensis 319 et 323, il faut ajouter Parisinus 1315 (prototype de l’éditeur), Angelicus 30, Atheniensis Bibl. nat., 2972, Lesbiensis Leim. 7; et la liste n’est sans doute pas complète.
Dans les sources historiques, Démétrius apparaît pour la première fois en janv. 1028, au synode présidé par Alexis Studite (Grumel, Regestes, n. 835). Avant la fin de 1029, Romain Argyre lui confère le titre de syncelle ainsi qu’à deux autres métropolites. En 1030, il assiste au synode tenu contre les jacobites de Méli-tène (Regestes, n. 839), dont le tome est confirmé en 1032 (Regestes, n. 840). En 1037, il figure parmi les opposants au patriarche Alexis (Regestes, n. 842). Après cela, il n’y a plus trace de lui dans les sources. On connaît cependant un poème de Christophore Mitylenaios (Gedichte, éd. Kurtz [Teubner], 13), adressé à Démétrius de Cyzique pour le consoler de sa podagre. Démétrius survécut à son patriarche, décédé en 1046, mais en 1054 (Regestes, n. 869), c’est Théophane qui est métropolite de Cyzique.
Citons pour mémoire une chronique perdue de Démétrius de Cyzique, connue par le seul témoignage de Skylitzès; on n’a aucune raison de penser que l’auteur diffère de notre métropolite.
Les oeuvres éditées se trouvent dans P. G., CXIX, 1097-1120 : il s’agit de deux consultations canoniques sur les empêchements de mariage.
Les oeuvres inédites se rencontrent dans deux mss., Vatic. gr. 712 et Ambrosianus 682 (Q 76 sup.), indépendants l’un de l’autre; seul l’Ambrosianus porte dans le titre le nom de Démétrius. Deux discours sont communs aux deux témoins : Δίκαιον ἡν ἡμᾶς τοῖς θεῖοις: s’adressant aux « empereurs », Démétrius, au nom des anciens canons, prétend interdire au patriarche de Constantinople de consacrer les évêques d’une autre éparchie et même les métropolites dont le sacre est réservé aux évêques de sa province. Δέσποτα ἡμῶν… οὐ τὸ ἴδιον θέλημα: discours à un empereur qui prétendait casser les sentences synodiques dans une missive où il écrivait : « Quiconque s’oppose à un écrit impérial, qu’il soit puni comme Démétrius sacrilège. » L’Ambrosianus a en propre un troisième discours : Ἐπειδή τινες ὡς οἴονται, contre ceux qui disent qu’on ne peut démissionner (de l’épiscopat). Le Vaticanus en a deux autres : Εδει μὲν ἡμᾶς ὧ παναγιώτατε δέσποτα : discours prononcé devant le patriarche contre ceux qui affirment que les synodes ne doivent pas avoir lieu chaque année à Constantinople mais dans les éparchies; Τίς λαλήσει τὰς δυναστείασ: discours devant l’empereur pour demander une loi précise concernant les degrés de parenté par rapport au mariage.
Ces opuscules sont essentiellement des dissertations canoniques et il n’est pas possible d’en fixer la date à première vue. Seul le discours 4, Vatic. 712, fol. 182v0-92, contient une donnée historique précise; l’orateur cite plusieurs exemples de synodes constantinopolitains, deux de Photius, le synode d’union (Nicolas), le synode qui rétablit Euthyme dans les diptyques sous Polyeucte, le synode de Sisinius, puis deux synodes du patriarche Antoine « que certains d’entre nous ont vu, ceux qui ont été admis par lui aux rangs du clergé » (fol. 190v°). Cette remarque suppose un certain éloignement dans le temps : ce serait peu avant 1054. D’autre part, dans ce discours, Démétrius prend une position assez contraire à celle qu’il soutient dans le premier où il demande une restriction de la juridiction patriarcale. On peut supposer que le premier est dirigé contre Alexis, avec la connivence d’un empereur (Michel IV?). Sous Cérulaire, Démétrius, âgé et assagi par sa podagre, semble avoir pris le parti du patriarche et soutenu ses prétentions jugées naguère anticanoniques. On peut voir aussi un rapport entre le discours sur le mariage et un acte de 1051-52 (Regestes, n. 858).
Il y a lieu de se demander si un autre discours, de tendance assez semblable à celle du premier, n’appartient pas au même métropolite. Il est contenu dans le Scorial. R I 15, fol. 24v°-47 : Καὶ πᾶσι μὲν ἄλλοις ἀρμόζειν et propose un retour à la discipline ancienne, c.-à-d. antérieure aux empiétements des patriarches de Constantinople.
Un ms. du xvıe s., Meteor. S. Stephani (cf.Νέος Ἑλληνομνήμων, xxi, 1927, p. 326), indique Démétrius de Cyzique comme auteur d’un opuscule sur le jeüne; c’est une erreur d’attribution, car ce texte, qui a été aussi attribué au patriarche Nicolas, est de Jean l’Oxite (cf. Échos d’Orient, xxxιι, 1933, p. 287-89).
En plus des ouvrages qui ont dû être cités au cours de l’article, voir : J. Croce, E. Hermann, Textus selecti ex operibus commentatorum byzantinorum juris ecclesiastici, Rome, 1939, p. 11-12; ils distinguent deux Démétrius. — Codices Vaticani Graeci, ΙΙΙ, recension R. Devreesse : le rédacteur rapproche le premier discours de l’époque d’Alexis Commène. — G. Garitte, La « Narratio de rebus Armeniae », Louvain, 1952, surtout 386-97. — V. Grumel, Les métropolites syncelles, dans (Revue des) Études Byzantines, 111, 1945, p. 94-95. — K. Krumbacher, Gesch. der byzant. Literatur; voir index où trois Démétrius de Cyzique sont distingués.[/ref]
Here is what ChatGPT gives us for it.
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DEMETRIUS OF CYZICUS. — There is no reason to believe in two Demetriuses of Cyzicus, or to distinguish the polemicist from the canonist; instead we should adhere to Lequien, Oriens Christianus, II, 758. The only argument advanced by L. Petit, in the Dictionnaire de théologie catholique (D. T. C.), in favour of the existence of the former, in the tenth century, is the address preceding the short treatise on the Jacobites, written at the request of Constantine Porphyrogenitus (P. G., cxxvii, 879–902). Now, this Porphyrogenitus cannot necessarily be identified with Constantine VII (944–59); his grandson, brother and successor of Basil II, Constantine VIII (1025–28), had far more reason to consult a churchman about the Jacobites than did his grandfather, who was sufficiently learned. Moreover, during the effective reign of Constantine VII, there is no place for a Demetrius on the see of Cyzicus, which was occupied continuously by Theodore. Indeed, before 946, the date of the death of Anastasius of Heraclea (Theoph. Cont., ed. Bonn, 439; S. Runciman, Romanus Lecapenus, 235), Theodore of Cyzicus, together with Anastasius, was a member of a commission charged with investigating Alexander of Nicaea: ms. Patm. 706, fol. 104. In 956, the same Theodore is noted for his opposition to Polyeuctus and, in 959, Constantine Porphyrogenitus came to visit him at Olympus shortly before his death (Cedrenus, II, 335, 337).
Petit seems to have revised the categorical opinion he expressed in the article Demetrius, for in the article Isaac the Armenian (D. T. C., viii, 13), he attributes the exposition of the Armenian errors to the metropolitan living under Alexis Studites (1025–46). In any case, this short treatise De Jacobitis et Chatzizariis must be clearly distinguished from the Narratio de rebus Armeniae, whose origins G. Garitte has recently elucidated: what is certain is that the latter has nothing to do with Demetrius of Cyzicus, except accidentally through the fault of copyists and, above all, editors after Combefis. To the manuscripts of the De Jacobitis indicated by L. Petit — Athous 927, 3666, 3758, 4501, Palatinus 356, Scorialensis R I 15, Constantinopolitanus S. Sepulcri 391, Mosquensis 319 and 323 — must be added Parisinus 1315 (the editor’s prototype), Angelicus 30, Atheniensis Bibl. nat. 2972, Lesbiensis Leim. 7; and the list is doubtless not complete.
In the historical sources, Demetrius appears for the first time in January 1028, at the synod presided over by Alexis Studites (Grumel, Regestes, no. 835). Before the end of 1029, Romanos Argyros conferred upon him the title of syncellus, as he did upon two other metropolitans. In 1030, he attended the synod held against the Jacobites of Melitene (Regestes, no. 839), whose tome was confirmed in 1032 (Regestes, no. 840). In 1037, he appears among the opponents of Patriarch Alexis (Regestes, no. 842). After this, there is no further trace of him in the sources. We do, however, know of a poem by Christopher of Mytilene (Gedichte, ed. Kurtz [Teubner], 13), addressed to Demetrius of Cyzicus to console him for his gout. Demetrius survived his patriarch, who died in 1046, but in 1054 (Regestes, no. 869), it is Theophanes who is metropolitan of Cyzicus.
For the record, we may mention a lost chronicle by Demetrius of Cyzicus, known only from the testimony of Scylitzes; there is no reason to think that its author was different from our metropolitan.
The published works are found in P. G., CXIX, 1097–1120: they consist of two canonical consultations concerning impediments to marriage.
The unpublished works are found in two manuscripts, Vatic. gr. 712 and Ambrosianus 682 (Q 76 sup.), independent of one another; only the Ambrosianus gives the name of Demetrius in the title. Two discourses are common to both witnesses:
Δίκαιον ἦν ἡμᾶς τοῖς θείοις (It is right to follow the divine canons): addressing the “emperors,” Demetrius, invoking the ancient canons, claims to prohibit the patriarch of Constantinople from consecrating bishops of another eparchy and even metropolitans whose consecration is reserved to the bishops of his own province.
Δέσποτα ἡμῶν… οὐ τὸ ἴδιον θέλημα (Our master… should not follow his own will): a discourse addressed to an emperor who was attempting to overturn synodal judgments, in a letter in which he had written: “Whoever opposes an imperial document, let him be punished like the sacrilegious.”
The Ambrosianus has a third discourse of its own: Ἐπειδή τινες ὡς οἴονται (Since certain people suppose…), directed against those who say that one cannot resign from the episcopate.
The Vaticanus has two more:
Ἔδει μὲν ἡμᾶς ὦ παναγιώτατε δέσποτα (It was indeed incumbent upon us, O most holy master): a discourse delivered before the patriarch against those who maintain that synods should not be held every year at Constantinople but in the eparchies;
Τίς λαλήσει τὰς δυναστείας (Who shall declare the mighty acts?): a discourse before the emperor requesting a precise law concerning degrees of kinship in relation to marriage.
These short works are essentially canonical dissertations, and it is not possible to establish their date at first sight. Only discourse 4, Vatic. 712, fols. 182v–192, contains a precise historical datum. The speaker cites several examples of Constantinopolitan synods: two under Photius, the synod of union (Nicholas), the synod that restored Euthymius to the diptychs under Polyeuctus, the synod of Sisinnius, and then two synods of Patriarch Antony, “which some of us have seen, those who were admitted by him to the ranks of the clergy” (fol. 190v). This remark presupposes a certain lapse of time: the speech would therefore date from shortly before 1054.
On the other hand, in this discourse Demetrius takes a position fairly contrary to that which he maintains in the first, where he calls for a restriction of patriarchal jurisdiction. One may suppose that the first was directed against Alexis, with the connivance of an emperor (Michael IV?). Under Cerularius, Demetrius, now elderly and chastened by his gout, seems to have taken the patriarch’s side and supported claims that he had formerly judged to be contrary to the canons. A connection may also be seen between the speech on marriage and a document of 1051–52 (Regestes, no. 858).
It is worth asking whether another speech, of a tendency quite similar to that of the first, does not also belong to the same metropolitan. It is contained in Scorial. R I 15, fols. 24v–47: Καὶ πᾶσι μὲν ἄλλοις ἁρμόζειν (And while it is fitting for all others), and advocates a return to the ancient discipline, that is, to the discipline preceding the encroachments of the patriarchs of Constantinople.
A sixteenth-century manuscript, Meteor. S. Stephani (cf. Νέος Ἑλληνομνήμων, xxi, 1927, p. 326), indicates Demetrius of Cyzicus as the author of a short treatise on fasting; this is an erroneous attribution, for this text, which has also been attributed to Patriarch Nicholas, is by John the Oxite (cf. Échos d’Orient, xxxii, 1933, pp. 287–89).
In addition to the works that cited in the course of the article, see:
J. Croce, E. Hermann, Textus selecti ex operibus commentatorum byzantinorum juris ecclesiastici, Rome, 1939, pp. 11–12; they distinguish two Demetriuses.
— Codices Vaticani Graeci, III, recension by R. Devreesse: the editor dates the first speech to the period of Alexios Komnenos.
— G. Garitte, La « Narratio de rebus Armeniae », Louvain, 1952, especially pp. 386–97.
— V. Grumel, Les métropolites syncelles, in (Revue des) Études Byzantines, III, 1945, pp. 94–95.
— K. Krumbacher, Gesch. der byzant. Literatur; see the index, where three Demetriuses of Cyzicus are distinguished.
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A few thoughts on this elderly article. The 19th century claims about two or more authors of the same name are not important now.
First a bibliographical point, which confused me initially. “Regestes” means V. Grumel, Les Regestes des actes du Patriarcat de Constantinople, fasc 3. (1932).
The lost history is worth a bit more discussion. In his introduction, Scylitzes mentions a lost Chronicle “of his own times and a little before” by Demetrius of Cyzicus, who is presumably our author.[ref]the CFHB 5 edition (1973) p.4, l.30.[/ref] This is translated by John Skyzilites: A Synopsis of Byzantine History, 811-1057, tr. John Wortley, CUP 2010, p.4:
Theodore Daphnopates, Niketas the Paphlagonian, Joseph Genesios and Manuel, these two of Constantinople, Nikephoros the deacon from Phrygia, Leo from Asia, Theodore, bishop of Side and his nephew of the same name who presided over the church of Sebasteia, Demetrios, bishop of Kyzikos and the monk John the Lydian – these all set themselves their own goals: maybe the glorification of an emperor, the censure of a patriarch, or to extol a friend – each attains his own ends under the guise of writing history and everyone of them falls far short of the mentality of those godly men of whom we spoke. For in composing a rambling account of his own times (and a little before) as though he was writing history, one of them writes a favourable account, another a critical one, while a third writes whatever he pleases and a fourth sets down what he is ordered to write. Each composes his own ‘history’ and they differ so much from each other in describing the same events that they plunge their audience into dizziness and confusion.
Setting aside this dismissal of rival authors, we learn that the work covered the times of Demetrius himself, and a period beforehand.
We can also expand on the mention of Romanus III Argyrus. Cedrenus records that before the end of 1029, Romanos III Argyros (1028-1034) conferred the title of Syncellus upon him and two other metropolitans, and that Romanos had thought well of Demetrius even before he became emperor.[ref]Cedrenus, Bonn edition (1839), vol. 2, p.486 lines-16, 487 line 8; from V. Grumel, Titulature de Métropolites Byzantins. I. Les métropolites syncelles, in (Revue des) Études Byzantines 3, 1945, pp. 92-114: p.94-5 n.14: “He also made three metropolitans into syncelli: Cyriacus of Ephesus, as being a kinsman of the patriarch; Demetrius of Cyzicus, whom he had greatly loved even before he became emperor; …”.[/ref]
The De Jacobitis et Chatzizariis was first edited by F. Combefis, in his two volume Novum Auctarium Graeco-Latinae Bibliothecae Patrum, volume 2, column 261 f., and his text has been reprinted ever since. Those looking for this volume online need to know that volume 2 of the book, (the Tomus Alter Historicis et Dogmaticus) of the 1648 edition is uniquely titled, and therefore catalogued, under the name of its core treatise: Historia Haeresis Monothelitarum sanctaeque in eam sextae synodi actorum vindiciae. It may be found online here. If you go to column 261, you will find that it is anonymous, but under the correct title, with parallel Latin translation and marginal notes. Only at the end does Combefis include a note attributing it to Demetrius of Cyzicus.
Let’s end with a screen-grab of that page:

