Gennadios II
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Gennadius II ( Greek Γεννάδιος Βʹ;
lay name A legal name is the name that identifies a person for legal, administrative and other official purposes. A person's legal birth name generally is the name of the person that was given for the purpose of registration of the birth and which then ap ...
Γεώργιος Κουρτέσιος Σχολάριος, ''Georgios Kourtesios Scholarios''; c. 1400 – c. 1473) was a
Byzantine Greek Medieval Greek (also known as Middle Greek, Byzantine Greek, or Romaic) is the stage of the Greek language between the end of classical antiquity in the 5th–6th centuries and the end of the Middle Ages, conventionally dated to the Ottoman co ...
philosopher and theologian, and Ecumenical Patriarch of Constantinople from 1454 to 1464. He was a strong advocate for the use of Aristotelian philosophy in the Orthodox Church. Gennadius was, together with his mentor,
Mark of Ephesus Mark of Ephesus ( Greek: Μάρκος ό Εφέσιος, born Manuel Eugenikos) was a hesychast theologian of the late Palaiologan period of the Byzantine Empire who became famous for his rejection of the Council of Ferrara-Florence (1438–1439) ...
, involved in the
Council of Florence The Council of Florence is the seventeenth ecumenical council recognized by the Catholic Church, held between 1431 and 1449. It was convoked as the Council of Basel by Pope Martin V shortly before his death in February 1431 and took place in ...
which aimed to end the schism between the Orthodox and Catholic churches. Gennadius had studied and written extensively on Catholic theology. After the failure of the union of Florence and the
Fall of Constantinople The Fall of Constantinople, also known as the Conquest of Constantinople, was the capture of the capital of the Byzantine Empire by the Ottoman Empire. The city fell on 29 May 1453 as part of the culmination of a 53-day siege which had begun o ...
, Gennadius became the first Ecumenical Patriarch of Constantinople under Ottoman rule. Just before the fall of Constantinople, and after Cardinal Isodore had celebrated a Latin Mass in St. Sophia to celebrate the ratification of the council of Florence, its citizens consulted Gennadius. Gibbon has him say: "O miserable Romans, why will ye abandon the truth? and why, instead of confiding in God, will ye put your trust in the Italians? In losing your faith you will lose your city. Have mercy on me, O Lord! I protest in thy presence that I am innocent of the crime. O miserable Romans, consider, pause, and repent. At the same moment that you renounce the religion of your fathers, by embracing impiety, you submit to a foreign servitude." A polemicist, Scholarios left in writing several treatises on the differences between Catholic and Orthodox theology, the Filioque, a defence of Aristotelianism and excerpts from an exposition (entitled ''Confession'') of the
Eastern Orthodox faith Eastern Orthodoxy, also known as Eastern Orthodox Christianity, is one of the three main branches of Chalcedonian Christianity, alongside Catholicism and Protestantism. Like the Pentarchy of the first millennium, the mainstream (or "canonical") ...
addressed to
Mehmed II Mehmed II ( ota, محمد ثانى, translit=Meḥmed-i s̱ānī; tr, II. Mehmed, ; 30 March 14323 May 1481), commonly known as Mehmed the Conqueror ( ota, ابو الفتح, Ebū'l-fetḥ, lit=the Father of Conquest, links=no; tr, Fâtih Su ...
.


Biography

He was born Georgios Kourtesios in Constantinople in c. 1400 and he belonged to an ethnic Greek family originally from the island of Chios; the name Scholarios (which was also a title) is thought to derive from a family member's position in the
Byzantine Navy The Byzantine navy was the naval force of the East Roman or Byzantine Empire. Like the empire it served, it was a direct continuation from its Imperial Roman predecessor, but played a far greater role in the defence and survival of the state than ...
or the imperial palace. His abecedary was
Mark of Ephesus Mark of Ephesus ( Greek: Μάρκος ό Εφέσιος, born Manuel Eugenikos) was a hesychast theologian of the late Palaiologan period of the Byzantine Empire who became famous for his rejection of the Council of Ferrara-Florence (1438–1439) ...
(d. 1444). Following his tutelage under the famous
John Chortasmenos John Chortasmenos ( gr, Ἰωάννης Χορτασμένος; – before June 1439) was a Byzantine monk and bishop of Selymbria, who was a distinguished bibliophile, writer, and teacher. Life Chortasmenos is first attested as a notary of the pa ...
("didaskalos" of the Patriarchal School), Manuel-Mark might have then recommended him to study under his own previous master, Georgios Gemistus Pletho (d. 1452/1454), c. 1428. However, his studies under Pletho are a matter of speculation and, at any rate, would have been more likely attendance at Pletho's lectures at Mistra. Scholarius had been a teacher of philosophy before entering the service of the emperor John VIII Palaeologus as a theological advisor. In fact, in 1437 – in anticipation of the
Council of Ferrara-Florence The Council of Florence is the seventeenth ecumenical council recognized by the Catholic Church, held between 1431 and 1449. It was convoked as the Council of Basel by Pope Martin V shortly before his death in February 1431 and took place in ...
– the emperor formally studied Nilus Cabasilas's works along with Mark of Ephesus and Gennadius Scholarius. Curiously, the trio also formally studied the works of John Duns Scotus (d. 1308) because of his rejection of the Filioque in Thomistic metaphysics, as well as Scotus' doctrine of a "formal distinction" between the persons and essence of God, as well as God's attributes (or "energies"). It was for this reason that Scholarius wrote an academic refutation of the first eighteen of Mark of Ephesus' "Syllogistic Chapters against the Latins." From this, we can surmise that Scholarius was likely writing an academic exercise to inform his former master that Thomas Aquinas' opinions did not constitute a universally Latin approach to questions on the Trinity.


Council of Florence

Georgios Scholarius became historically important when, as judge in the civil courts under John VIII (1425–1448), he accompanied his emperor to the council of Ferrara-Florence, held in 1438–1439 in
Ferrara Ferrara (, ; egl, Fràra ) is a city and ''comune'' in Emilia-Romagna, northern Italy, capital of the Province of Ferrara. it had 132,009 inhabitants. It is situated northeast of Bologna, on the Po di Volano, a branch channel of the main stream ...
and Florence. The object of this endeavor was bringing a union between the Greek and Latin Churches, which he supported at that time. He made four speeches at the council – all exceedingly conciliatory. At the same council appeared the celebrated Platonist, Gemistus Pletho, the most powerful opponent of the then dominant Aristotelianism, and consequently an antagonist of Scholarius. In church matters, as in philosophy, the two were opposed – Pletho advocated a partial return to Greek
paganism Paganism (from classical Latin ''pāgānus'' "rural", "rustic", later "civilian") is a term first used in the fourth century by early Christianity, early Christians for people in the Roman Empire who practiced polytheism, or ethnic religions ot ...
in the form of a syncretic union between Christianity and Zoroastrianism; while Scholarius, more cautious, pressed the necessity for ecclesiastical union with Rome on doctrinal grounds, and was instrumental in drawing up a form which from its vagueness and ambiguity might be accepted by both parties. Georgios Scholarius was at a serious disadvantage because, being a layman, he could not directly take part in the discussions of the council.


Return to Constantinople

Despite his initial advocacy of the union (and berating many of the Orthodox bishops for their lack of theological learnedness), Georgios Scholarius soured on union during the council, and left it early in June 1440. At the behest of his mentor
Mark of Ephesus Mark of Ephesus ( Greek: Μάρκος ό Εφέσιος, born Manuel Eugenikos) was a hesychast theologian of the late Palaiologan period of the Byzantine Empire who became famous for his rejection of the Council of Ferrara-Florence (1438–1439) ...
, who converted him completely to anti-Latin Orthodoxy, until his death, Georgios Scholarius was known (with Mark of Ephesus) as the most uncompromising enemy of the union. It was at just about this time (1444) that he began to draw attention to the putative heterodoxy of Aquinas' "distinction of reason" between the attributes (viz., energies) and essence of God. First, as contained in Martin Jugie's edition of his ''opera omnia'', Georgios Scholarius interrupts chapters 94–96 of his discourse "On Being and Essence" of Thomas Aquinas, and replaces the Thomistic explanation with that of Scotism in order to agree better with Palamas. However, he initially mitigates total condemnation of Aquinas, noting that later Scholastics (like
Hervaeus Natalis Hervaeus Natalis (c. 1260, Nédellec, diocese of Tréguier, Brittany-1323) was a Dominican theologian, the 14th Master of the Dominicans, and the author of a number of works on philosophy and theology. Among his many writings may be included the ...
) interpret Aquinas in a more Orthodox light. This point marks Scholarius' increasing theological distance from Aquinas, where he begins to be more theologically condemnatory of him in later works (e.g., his treatises on the Holy Spirit and his Preface to the Greek "Summa Theologiae"). However, this distance can be overstated. Marcus Plested observes that Scholarios' "love and esteem for Thomas was to continue undimmed throughout his career" "although he would often accentuate the note of caution in later works."Marcus Plested (2012) ''Orthodox Readings of Aquinas'', Oxford University Press, pp. 128,129 Despite his cautions, Scholarios writes of Thomas "we love this divinely-inspired and wise man." He wrote many works to defend his new convictions, which differ so much from the earlier conciliatory ones that Allatius thought there must be two people of the same name; to whom
Gibbon Gibbons () are apes in the family Hylobatidae (). The family historically contained one genus, but now is split into four extant genera and 20 species. Gibbons live in subtropical and tropical rainforest from eastern Bangladesh to Northeast India ...
: " Renaudot has restored the identity of his person, and the duplicity of his character". After the death of John VIII in 1448, Georgios entered the Pantokrator monastery in Constantinople under Constantine XI (1448–1453) and took, according to the invariable custom, a new name: Gennadius. Before the fall of the city he was already well known as a bitter opponent of the union. He and Mark of Ephesus were the leaders of the anti-Latin party. In 1444, Mark of Ephesus on his deathbed praised Gennadius's irreconcilable attitude towards the Latins and the union. It was to Gennadius that the angry people went after seeing the Uniate services in the great church of Hagia Sophia. It is said that he hid himself, but left a notice on the door of his cell: "O unhappy Romans, why have you forsaken the truth? Why do you not trust in God, instead of in the Italians? In losing your faith you will lose your city."


Ottoman period

After the
fall of Constantinople The Fall of Constantinople, also known as the Conquest of Constantinople, was the capture of the capital of the Byzantine Empire by the Ottoman Empire. The city fell on 29 May 1453 as part of the culmination of a 53-day siege which had begun o ...
, Gennadius was taken prisoner by the Turks. In administering his new conquest, 21-year-old conquering Sultan
Mehmed II Mehmed II ( ota, محمد ثانى, translit=Meḥmed-i s̱ānī; tr, II. Mehmed, ; 30 March 14323 May 1481), commonly known as Mehmed the Conqueror ( ota, ابو الفتح, Ebū'l-fetḥ, lit=the Father of Conquest, links=no; tr, Fâtih Su ...
wished to assure the loyalty of the Greek population and above all avoid them appealing to the Roman Catholics for liberation, potentially sparking a new round of Crusades. Mehmed therefore sought the most anti-Catholic cleric he could find as a figure of unity for the Greeks under Turkish rule – and Gennadius as leading anti-Union figure was a natural choice. On 1 June 1453, just three days after the fall of the city, the new Patriarch's procession passed through the streets where Mehmed received Gennadius graciously and himself invested him with the signs of his office – the crosier (''dikanikion'') and mantle. This ceremonial investiture would be repeated by all sultans and patriarchs thereafter. The city's famous patriarchal basilica, the Hagia Sophia, had already been converted into a mosque by the conquerors, so Gennadius established his seat at the Church of the Holy Apostles. Three years later the edifice, which was in a dilapidated state (in 1461 it was demolished by the Ottomans to make way for the Fatih Mosque), was abandoned by the Patriarch, who moved again to the Church of the Pammakaristos. The Ottomans divided their Empire into '' millets'' or subject nations, of which the Greeks were the largest, known as the Rum Millet. The Patriarch was appointed the official head or '' Ethnarch'' of the Greek millet, which was used as the Ottomans as a source for imperial administrators. Gennadius became a political authority as well as a religious one, as were all his successors under the Ottomans. As was normal when a monk or lay scholar was appointed patriarch, Gennadius was consecutively ordained, first as a deacon, then as a priest, then finally as a bishop before being appointed patriarch.


Patriarch

In the spring of 1454 he was consecrated by the
metropolitan Metropolitan may refer to: * Metropolitan area, a region consisting of a densely populated urban core and its less-populated surrounding territories * Metropolitan borough, a form of local government district in England * Metropolitan county, a typ ...
of Heraclea Perinthus, but, since both the Church of Hagia Sophia and the palace of the patriarch were now in the hands of the Ottomans, he took up his residence successively in two monasteries of the city. While holding the episcopal office Gennadius drew up, apparently for the use of Mehmed, a confession or exposition of the Christian faith, which was translated into Turkish by Ahmed, Qadi of Berrhoea (and first printed by A. Brassicanus at Vienna in 1530). Gennadius was unhappy as patriarch, and tried to abdicate his position at least twice; in 1456 he resigned. The full reason for this step commonly attributed to his disappointment at the sultan's treatment of Christians, though Mehmed seems to have kept the fairly tolerant conditions he had allowed to them; various writers hint darker other motives. Eventually, he found the tensions between the Greeks and the Ottomans overwhelming. He was later called two times to guide the Christian community as Patriarch during the turbulent period that followed the patriarchate of Isidore II. There is no consensus among scholars about the exact dates of his last two patriarchates: according to Kiminas (2009), he reigned again from April 1463 to c. June 1463 and from August 1464 to autumn 1465. Blanchet objects to the existence itself of these two additional terms. Gennadius then, like so many of his successors, ended his days as an ex-patriarch and a monk. He lived in the monastery of John the Baptist near
Serrae Sérres ( el, Σέρρες ) is a city in Macedonia, Greece, capital of the Serres regional unit and second largest city in the region of Central Macedonia, after Thessaloniki. Serres is one of the administrative and economic centers of Northe ...
in
Macedonia Macedonia most commonly refers to: * North Macedonia, a country in southeastern Europe, known until 2019 as the Republic of Macedonia * Macedonia (ancient kingdom), a kingdom in Greek antiquity * Macedonia (Greece), a traditional geographic reg ...
, where he wrote books until he died in about 1473. Gennadius fills an important place in Byzantine history. He was the last of the old school of polemical writers and one of the greatest. Unlike most of his fellows he had an intimate acquaintance with Latin theological literature, especially with St. Thomas Aquinas and other Scholastics. He was as skillful an opponent of Catholic theology as
Mark of Ephesus Mark of Ephesus ( Greek: Μάρκος ό Εφέσιος, born Manuel Eugenikos) was a hesychast theologian of the late Palaiologan period of the Byzantine Empire who became famous for his rejection of the Council of Ferrara-Florence (1438–1439) ...
, and a more learned one. However, his opposition to Aquinas can be overstated. Marcus Plested observes that Scholarios' "love and esteem for Thomas was to continued undimmed throughout his career" "although he would often accentuate the note of caution in later works." Despite his cautions Scholarios writes of Thomas "we love this divinely-inspired and wise man."Luis Petit, Xenophon Sidéridès, Martin Jugie, Eds. (1928-36), ''Oeuvres Complètes de Georges Scholarios'' 8 vols., Paris, VI:177-8. quoted in Plested, p. 129 His writings show him to be a student not only of Western philosophy but of controversy with Jews and Muslims, of the great Hesychast question (he attacked Barlaam and defended the monks; naturally, the Barlaamites were "latinophrones"), in short, of all the questions that were important in his time. He has another kind of importance as the first Patriarch of Constantinople under the Turks. From this point of view he stands at the head of a new period in the history of his Church; the principles that regulated the condition of Orthodox Christians in the Turkish Empire are the result of Mehmed II's arrangement with him.


Writings

About 100 to 120 of his alleged writings exist, some of which have never been published, and some of which are of doubtful authenticity. As far as is known, his writings may be classified into philosophical (interpretations of Aristotle, Porphyry and others), translations of Peter of Spain and Thomas Aquinas, defenses of Aristotelianism against the recrudescence of Neoplatonism) and theological and ecclesiastical (partly concerning the union and partly defending Christianity against Muslims, Jews, and
pagan Paganism (from classical Latin ''pāgānus'' "rural", "rustic", later "civilian") is a term first used in the fourth century by early Christians for people in the Roman Empire who practiced polytheism, or ethnic religions other than Judaism. ...
s), in addition to numerous homilies, hymns, and letters. Gennadius was a prolific writer during all the periods of his life. The complete works of Gennadius were published in eight volumes by Jugie, Petit & Siderides, 1928–1936. (Note: this edition supersedes the references made below.)


First Period (pro-Union)

The chief works of this time are the "speeches" made at the
Council of Florence The Council of Florence is the seventeenth ecumenical council recognized by the Catholic Church, held between 1431 and 1449. It was convoked as the Council of Basel by Pope Martin V shortly before his death in February 1431 and took place in ...
, also a number of letters addressed to various friends, bishops, and statesmen, mostly unedited. An ''Apology for five chapters of the Council of Florence'' is doubtful. A ''History of the Council of Florence'' under his name (in manuscript only) is really identical with that of Syropulos.


Second Period (anti-Union)

A great number of polemical works against Latins were written in this time. Two books about the ''Procession of the Holy Ghost''; another one "against the insertion of the '' Filioque'' in the Creed"; two books and a letter about " Purgatory"; various sermons and speeches; a ''
Panegyric A panegyric ( or ) is a formal public speech or written verse, delivered in high praise of a person or thing. The original panegyrics were speeches delivered at public events in ancient Athens. Etymology The word originated as a compound of grc, ...
of Marcus Eugenicus'' (in 1447), etc. Some translations of works of St. Thomas Aquinas, and polemical treatises against his theology by Gennadius are still unedited, as is also his work against the Barlaamites. However, his hostility toward Aquinas can be overstated. Marcus Plested observes that Scholarios' "love and esteem for Thomas was to continue undimmed throughout his career" "although he would often accentuate the note of caution in later works." Despite his cautions Scholarios writes of Thomas "we love this divinely-inspired and wise man." There are also various philosophical treatises of which the chief is a ''Defence of Aristotle'' (''antilepseis hyper Aristotelous'') against the Neoplatonist, Gemistus Pletho. His most important work is easily his "Confession" (''Ekthesis tes pisteos ton orthodoxon christianon'', generally known as ''Homologia tou Gennadiou'') addressed to
Mehmed II Mehmed II ( ota, محمد ثانى, translit=Meḥmed-i s̱ānī; tr, II. Mehmed, ; 30 March 14323 May 1481), commonly known as Mehmed the Conqueror ( ota, ابو الفتح, Ebū'l-fetḥ, lit=the Father of Conquest, links=no; tr, Fâtih Su ...
. It contains twenty articles, of which however only the first twelve are authentic. It was written in Greek; Achmed, Qadi of Berrhoea, translated it into
Turkish Turkish may refer to: *a Turkic language spoken by the Turks * of or about Turkey ** Turkish language *** Turkish alphabet ** Turkish people, a Turkic ethnic group and nation *** Turkish citizen, a citizen of Turkey *** Turkish communities and mi ...
. This is the first (in date) of the Orthodox Symbolic books. It was published first (in Greek and Latin) by Brassicanus (Vienna, 1530), and again by Chytræus (Frankfurt, 1582). Martin Crusius printed it in Greek, Latin, and Turkish (in Greek and Latin script) in his ''Turco-Græcia'' (Basle, 1584 reprinted in '' Patrologia Graeca'', CLX 333, sqq.). Rimmel reprinted it (Greek and Latin) (in his ''Monumenta fidei Eccl. Orient.'' (Jena, 1850), I, 1–10.); and Michalcescu in Greek only. There exists an arrangement of this Confession in the form of a dialogue in which Mehmed asks questions ("What is God?" – "Why is he called ''theos''?" – "And how many Gods are there?" and so on) and Gennadius gives suitable answers. This is called variously Gennadius's ''Dialogue'' (''dialexis'', διάλεξις), or ''Confessio prior'', or ''De Via salutis humanæ'' (''Peri tes hodou tes soterias anthropon''). Rimmel prints it first, in Latin only, and thinks it was the source of the Confession. It is more probably a later compilation made from the Confession by someone else. It should be noticed that Gennadius's (quasi-Platonic) philosophy is in evidence in his Confession (God cannot be interpreted, ''theos'' from ''theein'', etc.; cf. Rimmel). Either for the same reason or to spare Muslim susceptibility he avoids the word ''Prosopa'' in explaining the Trinity, speaking of the three Persons as ''idiomata'' "which we call
Hypostases Hypostasis, hypostatic, or hypostatization (hypostatisation; from the Ancient Greek , "under state") may refer to: * Hypostasis (philosophy and religion), the essence or underlying reality ** Hypostasis (linguistics), personification of entities ...
".


Third Period (post-resignation)

During the third period, from his resignation to his death (1459–1468), he continued writing theological and polemical works. An
encyclical An encyclical was originally a circular letter sent to all the churches of a particular area in the ancient Roman Church. At that time, the word could be used for a letter sent out by any bishop. The word comes from the Late Latin (originally from ...
letter to all Christians ''In defence of his resignation'' is unedited, as are also a ''Dialogue with two Turks about the divinity of Christ'', and a work about the ''Adoration of God''. Jahn (''Anecdota græca'') has published a ''Dialogue between a Christian and a Jew'' and a collection of ''Prophecies about Christ'' gathered from the
Old Testament The Old Testament (often abbreviated OT) is the first division of the Christian biblical canon, which is based primarily upon the 24 books of the Hebrew Bible or Tanakh, a collection of ancient religious Hebrew writings by the Israelites. The ...
. A treatise, ''About our God, one in three, against Atheists and Polytheists'', is chiefly directed against the theory that the world may have been formed by chance. Five books, ''About the Foreknowledge and Providence of God'' and a ''Treatise on the manhood of Christ'', are also in '' Patrologia Graeca'', CLX. Lastly, there are many homilies by Gennadius, most of which exist only in manuscript at
Mount Athos Mount Athos (; el, Ἄθως, ) is a mountain in the distal part of the eponymous Athos peninsula and site of an important centre of Eastern Orthodox monasticism in northeastern Greece. The mountain along with the respective part of the penins ...
.''Codd. Athous'', Paris, 1289–1298.


In popular media

* In 2012 film, '' Fetih 1453'', Gennadius is played by
Adnan Kürtçü Adnan ( ar, عدنان, 'adnān) is the traditional ancestor of the Adnanite Arabs of Northern, Western, Eastern and Central Arabia, as opposed to the Qahtanite Arabs of Southern Arabia who descend from Qahtan. His ancestry can be traced back t ...
. * Gennadius is a significant character in the historical novel Porphyry and Ash which covers the final year of the Byzantine Empire and the controversy of the act of union. * Appears in novel The Dark Angel by Mika Waltari.


See also

* Greek scholars in the Renaissance *
Joannes Chortasmenos John Chortasmenos ( gr, Ἰωάννης Χορτασμένος; – before June 1439) was a Byzantine monk and bishop of Selymbria, who was a distinguished bibliophile, writer, and teacher. Life Chortasmenos is first attested as a notary of the pa ...


Notes

* *


Citations


Bibliography

* * * * * *


Further reading

*
Athanasios Angelou Athanasios Angelou ( el, Αθανάσιος Αγγέλου) is a Greek university teacher of Byzantine Literature, and has served as Dean of the School of Philosophy at the University of Ioannina and Artistic Director of cultural presentations. Bi ...
‘'Who am I?’’ Scholarios' answers and the Hellenic identity", in Φιλέλλην. Studies in honour of Robert Browning, Venice 1996, p. 1-19. * Marie-Hélène Blanchet, ''Georges-Gennadios Scholarios (vers 1400-vers 1472): un intellectuel orthodoxe face à la disparition de l'empire byzantin'', Institut Français d'Études Byzantines, Paris, 2008. * Joseph Gill, 'George Scholarius', in J. Gill, ''Personalities of the Council of Florence and other Essays'', Oxford, 1964, pp. 79–94. * * Livanos, Christopher, "Greek Tradition and Latin Influence in the Work of George Scholarios," Gorgias Press, 2006. * * * Eugenia Russell, "St Demetrius of Thessalonica; Cult and Devotion in the Middle Ages", Peter Lang, Oxford, 2010. * C.J.G. Turner, 'The career of Georgios Gennadios Scholarios', ''Byzantion'' 39 (1969), 420–55 * C.J.G. Turner, 'George Gennadius Scholarius and the Council of Florence', ''Journal of Theological Studies'' 18 (1967), 83–103
Thesaurus Linguae Graecae: Bibliography of Gennadius Scholarius
{{DEFAULTSORT:Gennadios 02 of Constantinople, Patriarch 1400 births 1473 deaths People from Constantinople Byzantine theologians Byzantine philosophers 15th-century Greek people Greek Renaissance humanists 15th-century patriarchs of Constantinople 15th-century Eastern Orthodox theologians Byzantine saints of the Eastern Orthodox Church 15th-century Byzantine writers