The dark age was not completely dark. It saw, for example, the extensive but exceedingly uninspired work of the grammarians Georgius Choeroboscus, active during the second half of the 8th century, and Theognostus, early in the 9th century, as well as the letters of the deacon Ignatius with their surprising wealth of literary allusions. Also, certain developments that occurred at this time were important for the future. In about 800, paper was acquired from the Arabs, who are said to have learned how to make it from Chinese prisoners taken in a battle at Samarkand. It came into general use only very gradually; the Byzantines continued to import it from the Arabs instead of making their own, but since it was less expensive than papyrus, its effect was bound to be important. The Italians acquired it from the Byzantines, and by the 13th century they had developed a flourishing paper industry. From the 9th century must date the invention of a new cursive script, the Byzantine minuscule, which was in its early forms the most elegant that the Greeks ever invented. The earliest surviving specimen, the Uspenskij Gospel, dates from 835, but this displays such accomplished writing that the new script probably originated some 50 years earlier. The invention greatly facilitated the rapid production of books. The Stoudion monastery in Constantinople, which flourished under its great abbot St. Theodore (759–826), was once thought to have introduced the new script—and indeed the monastery had a flourishing scriptorium—but this conjecture is by no means certain. During the 9th and 10th centuries the works of many classical authors were transferred from manuscripts in the old uncial writing to the new minuscule, and the surviving books of this period show that script in its most perfect form. Later the elegance of minuscule was spoiled by the admixture of uncial letters and the increasing use of ligatures.

The first important scholar of the first Byzantine renaissance was Leo the Philosopher (c. 790–c. 869), a notable teacher in Constantinople who numbered among his pupils St. Cyril, one of the apostles of the Slavs; Leo had considerable knowledge of Greek culture, particularly of science and mathematics. But the dominant figure in the revival of the 9th century was the patriarch Photius (c. 820–891?), who not only compiled a notable Greek lexicon but also produced the Myriobiblon, or Bibliotheca, a vast collection of summaries and evaluations of various ancient books, mainly historical. Photius also compiled a learned miscellany called the Amphilochia and an interesting collection of letters. Arethas (born c. 850), archbishop of Caesarea in Cappadocia, owned a remarkable private library, from which eight priceless books, commissioned from the finest calligraphers of the time, survive; Euclid, Plato, Aristotle, Lucian, and Aristides are among them. Other valuable classical manuscripts still extant formed part of his collection.

During the 10th century education was encouraged by the learned emperor Constantine VII Porphyrogenitus (905–959), who apart from producing his own series of historical works preserved several histories by others and planned a vast 53-section encyclopaedia of human activities that was probably never completed. The 10th century also saw the production of a large encyclopaedia cum dictionary, formerly thought to have been the work of one Suidas, but now known to have been called the Suda, from a Byzantine Greek word for fortress. Platonism was actively studied by the chief intellectual figure of the 11th century, Michael Psellus (1018–c. 1078). His numerous writings show a wide acquaintance with classical culture, though also a very imperfect sympathy with some of its elements. His pupil, John Italus, was anathematized by the ecclesiastical authorities for allowing Platonism to contaminate his Christianity. But Platonic studies continued, and Isaac Sebastocrator, a brother or son of the emperor Alexius I Comnenus, wrote three essays based on Proclus. Early in the 12th century Alexius’ daughter, Anna Comnena, was the centre of a circle of Aristotelian scholars, including Michael of Ephesus and Eustratius, who together produced a commentary on the Ethics. Gregory of Corinth, active during the same period, wrote works on syntax and style and also one of the few ancient treatments of the Greek dialects that have come down to the present. John Tzetzes wrote some 60 books on Greek literature that are learned but uncritical, and Eustathius of Thessalonica wrote vast commentaries on the Iliad and Odyssey that incorporate much earlier learning.

This epoch of Byzantine learning was rudely put to an end when the knights of the Fourth Crusade, under Venetian leadership, sacked Constantinople in 1204. It may well be argued that this event was an even greater disaster for learning than the Turkish capture of the city in 1453, for which the crusaders paved the way. The sack of the city destroyed a quantity of Greek literature that is difficult to estimate; certainly included among the lost works were the Aitia and Hekale of Callimachus, which were known to Michael Choniates, archbishop of Athens at the time of the Crusade.

The second Byzantine renaissance

Between 1204, when the imperial capital was moved to Nicaea, and 1261, when Constantinople was recovered by the Palaeologus dynasty, classical studies continued under the difficult conditions outlined in the autobiography of Nicephorus Blemmydes, the leading intellectual of the time. The emperor Theodore II Lascaris (reigned 1254–58) did much to assist cultural life during this time. The period sometimes called the Palaeologan Renaissance saw a revival of classical studies that, under the circumstances, must be called remarkable. Maximus Planudes (1260–c. 1310) made many compilations, including a new anthology of epigrams, and even translated into Greek such Latin texts as parts of Ovid, Augustine, and Boethius. He also had some knowledge of Hellenistic poetry and even Arab astronomy and mathematics. From about 1300 the texts of the Greek dramatists were studied critically by Manuel Moschopoulos, Thomas Magister, and finally Demetrius Triclinius. Triclinius had read the metrical handbook of the 2nd-century scholar Hephaestion and understood the simpler metres, and he was also aware of the principle of strophic responsion. He was therefore able to make a number of emendations worthy of serious notice. Theodore Metochites (c. 1260–1332), one of the leading intellectuals and public men of his time, commented on Aristotle and wrote a miscellany that contains interesting reflections upon classical authors, especially orators and historians.

Greek in the West

During the 3rd and 4th centuries the knowledge of Greek in the West died out with shocking suddenness; Augustine had only a rudimentary knowledge of the Greek language, and translators such as Jerome (c. 347–419/420) and Rufinus (c. 345–410/411) were scarce indeed. The few Greek studies were undertaken for the sake of theology or philosophy, and translation of secular authors was rare; Calcidius’ (Chalcidius’) 4th-century version of the Timaeus was for eight centuries the only Latin translation of a Platonic dialogue, Boethius’ plan for a series of translations of Plato and Aristotle being interrupted by his execution. Sicily remained Byzantine until the Arab conquest of the 9th century, and Calabria, Lucania, and Apulia (Puglia) until the Norman conquest of the 11th century. The Normans and later the Hohenstaufen rulers favoured Greek studies. In the 12th century Greek, too, benefited from the intellectual revival; Henricus Aristippus, archdeacon of Catania, translated Plato’s Meno and Phaedo, and the admiral Eugenius collaborated in a Latin version of the Almagest, an encyclopaedia compiled by the astronomer Ptolemy of Alexandria in the 2nd century ad. Also during the 12th century two Italian scholars, James of Venice and Burgundio of Pisa, traveled to Constantinople in search of theological and philosophical learning; Burgundio brought back literary as well as theological manuscripts, though he was probably incapable of reading them. The Aristotelian revival of the 13th century led to the production of many translations of Aristotle by William of Moerbeke in Rome, and in England Aristotle was read in the original by Robert Grosseteste and Roger Bacon. During the 14th century contact between Rome and Constantinople was continued; Petrarch (see below Latin scholarship) acquired a Byzantine manuscript of Homer, though he never made the effort to enable himself to read it, and later in the century another such manuscript was in the hands of the humanists of Padua. In about 1397 the Byzantine scholar Manuel Chrysoloras went to Italy to teach Greek in Florence. At the Council of Ferrara-Florence in 1438–45 the union of the churches was agreed upon, but it was later repudiated. George Gemistus Plethon (c. 1355–1450/52), the famous Neoplatonist of Mistra, was present at that council; with him was his pupil John Bessarion of Trebizond (1403–72), who continued to support church union as an individual, so that when the repudiation took place he converted to the Western church. He stayed behind in Italy, became a cardinal, and made an important gift of books to Venice. Early in the 15th century Italians such as Francesco Filelfo and Giovanni Aurispa were bringing back Greek manuscripts from Constantinople in large quantities, so that well before the capture of Constantinople by the Turks in 1453 many Greek books had found their way to the West.