The Carolingian Renaissance

Apart from the effect Charlemagne had on politics, education and literacy in general, art, architecture -- you must take a look at the Palace of Aachen if you're ever in the area -- and the beginnings of German literature, his impact on Classical studies was immense. Here is a list, given by LD Reynolds in the introduction to Texts and Transmission, 1983, p xxviii, of authors and anonymous works of the Latin Classics for which we possess 9th-century manuscripts:

Agrimensores, Ammianus, Apicius, Apuleius, Aratea, Ausonius, Avianus, Caelius, Aurelianus, Caesar, Celsus, Censorinus, Charisius, Cicero, Claudian, Columella, Curtius Rufus, Donatus, Eutropius, Faventius, Florus, Frontinus, Gellius, Grattius, Historia Augusta, Horace, Hyginus, Justinus, Juvenal, Livy, Lucan, Lucretius, Macrobius, Martial, Martianus Capella, Pomponius Mela, Nemesianus, Nonius Marcellus, Notitia dignitatum, Ovid, Palladius, Julius Paris, Persius, Petronius, Phaedrus, the Elder and Younger Pliny, Publius, Querolus, Quintilian, Rhetores latini minores, Rhetorica ad Herennium, Sallust, the Elder and Younger Seneca, Q Serenus, Servius, Solinus, Statius, Suetonius, Tacitus, Terence, Valerius Flaccus, Valerius Maximus, Vergil, Vibius Sequester and Vitruvius.

And, as Reynolds points out ibid, there were once even more 9th century manuscripts, which the 15th-century Humanists discovered and then lost. And it may be that still more 9th-century manuscripts have come to light since 1983, I'm not sure. Compare this with the 7th century, from which survives (ibid, p xvi) a fragment of Lucan as the solitary Classical artifact.

Some lists of manuscripts have more significance than others. The above list shows how one monarch transformed the study of Classical Latin, because almost all of the 9th-century manuscripts in that list were made in monasteries and school either newly built or rejuvenated, mostly the former, on Charlemagne's orders.

Countless Classical scholars over the past 1200 years have been immensely grateful for the Carolingian minuscule, the form of handwriting developed in Charlemagne's time which has made reading those 9th-century manuscripts so much easier than so many manuscripts written both earlier and later.

All of this makes Charlemagne's own case more poignant: although he was said to have spoken Latin, Arabic and Greek in addition to his native German -- which may seem less farfetched to you when consider that his empire bordered on Arab-controlled Spain to the south-west and Greek Byzantium to the east -- he never quite mastered writing. Einhard describes how, late in his life, he did his writing lessons in bed before going to sleep, but never did quite get the hang of it. Some people don't believe Einhard's description. To me it rings true. I suppose the question must remain unsolved for now.

Another question which can't be answered, in part because it's difficult to quantify, is, which single person has done the most to rescue the literature of ancient Rome. Some have said Cassidorius. Others have said Poggio, but we know that those people are half-educated bozos. Perhaps I'm biased, perhaps I've been taken in by by the lingering effects of some medieval legends, but to me, it's always seemed clear that it was Charlemagne.