The main uncials known in the 17th and 18th centuries were: A, D, D^p, E^a, and C.

A, Codex Alexandrinus, is an early-5th-century manuscript containing most of the New Testament but with lacunae (gaps) in Matthew, John, and II Corinthians, plus the inclusion of the extracanonical I and II Clement. In the Gospels, the text is of the Byzantine type, but, in the rest of the New Testament, it is Alexandrian. In 1627 the A uncial was presented to King Charles I of England by the Patriarch of Constantinople; it has been in the British Museum, in London, since 1751.

D, Codex Bezae Cantabrigiensis, is a 5th-century Greco-Roman bilingual text (with Greek and Latin pages facing each other). D contains most of the four Gospels and Acts and a small part of III John and is thus designated D^ea (e, for evangelia, or “gospels”; and a for acta, or Acts). In Luke, and especially in Acts, D^ea has a text that is very different from other witnesses. Codex Bezae has many distinctive longer and shorter readings and seems almost to be a separate edition. Its Acts, for example, is one-tenth longer than usual. D represents the Western text tradition. D^ea was acquired by Theodore Beza, a Reformed theologian and classical scholar, in 1562 from a monastery in Lyon (in France). He presented it to the University of Cambridge, England, in 1581 (hence, Beza Cantabrigiensis).

D^p, Codex Claromontanus, of the same Western text type although not remarkably dissimilar from other known texts, contains the Pauline Letters including Hebrews. D^p (p, for Pauline epistles) is sometimes referred to as D₂. Beza acquired this 6th-century manuscript at about the same time as D^ea, but D^p was from the Monastery of Clermont at Beauvais (hence, Claramontanus). It is now in the Bibliothèque Nationale, in Paris.

E^a, Codex Laudianus, is a bilingual Greco-Latin text of Acts presented in 1636 by Archbishop Laud, an Anglican churchman, to the Bodleian Library at Oxford. It is a late-6th- or early-7th-century manuscript often agreeing with D^ea and its Western readings but also having a mixture of text types, often the Byzantine.

C, Codex Ephraemi Syri rescriptus, is a palimpsest. Originally written as a biblical manuscript in the 5th century, it was erased in the 12th century, and the treatises or sermons of Ephraem Syrus, a 4th-century Syrian Church Father, were written over the scraped text. The manuscript was found c. 1700 by the French preacher and scholar Pierre Allix; and Tischendorf, with the use of chemical reagents, later deciphered the almost 60 percent of the New Testament contained in it, publishing it in 1843. The text had two correctors after the 5th century but is, on the whole, Byzantine and reflects the not too useful common text of the 9th century.

Although there are numerous minuscules (and lectionaries), their significance in having readings going back to the first six centuries ce was not noted until textual criticism had become more refined in later centuries.

The main uncials and some significant minuscules that were discovered and investigated in the 19th century changed the course of the textual criticism and led the way to better manuscript evidence and methods of dealing with it. This has continued into the 20th century. The main new manuscript witnesses are designated ℵ or S, B, W, and Θ.

ℵ or S, Codex Sinaiticus, was discovered in 1859 by Tischendorf at the Monastery of St. Catherine at the foot of Mt. Sinai (hence, Sinaiticus) after a partial discovery of 43 leaves of a 4th-century biblical codex there in 1844. Though some of the Old Testament is missing, a whole 4th-century New Testament is preserved, with the Letter of Barnabas and most of the Shepherd of Hermas at the end. There were probably three hands and several later correctors. Tischendorf convinced the monks that giving the precious manuscript to Tsar Alexander II of Russia would grant them needed protection of their abbey and the Greek Church. Tischendorf subsequently published ℵ (S) at Leipzig and then presented it to the Tsar. The manuscript remained in Leningrad until 1933, during which time the Oxford University Press in 1911 published a facsimile of the New Testament from photographs of the manuscript taken by Kirsopp Lake, an English biblical scholar. The manuscript was sold in 1933 by the Soviet regime to the British Museum for £100,000. The text type of ℵ is in the Alexandrian group, although it has some Western readings. Later corrections representing attempts to alter the text to a different standard probably were made about the 6th or 7th century at Caesarea.

B, Codex Vaticanus, a biblical manuscript of the mid-4th century in the Vatican Library since before 1475, appeared in photographic facsimile in 1889–90 and 1904. The New Testament lacks Hebrews from chapter 9, verse 14, on the Pastorals, Philemon, and Revelation. Because B has no ornamentation, some scholars think it slightly older than ℵ. Others, however, believe that both B and ℵ, having predominantly Alexandrian texts, may have been produced at the same time when Constantine ordered 50 copies of the Scriptures. As an early representation of the Alexandrian text, B is invaluable as a most trustworthy ancient Greek text.

W, Codex Washingtonianus (or Freerianus), consists of the four Gospels in the so-called Western order (Matthew, John, Luke, and Mark, as D^ea). It was acquired in Egypt by C.L. Freer, an American businessman and philanthropist (hence, the Freer-Gospels), in 1906 and is now in the Freer Gallery of Art of the Smithsonian Institution, in Washington, D.C. Codex Washingtonianus is a 4th–5th-century manuscript probably copied from several different manuscripts or textual families. The Byzantine, Western (similar to Old Latin), Caesarean, and Alexandrian text types are all represented at one point or another. One of the most interesting variant readings is a long ending to the Gospel According to Mark following a reference to the risen Christ (not found in most manuscript traditions).

Θ, Codex Koridethianus, is a 9th-century manuscript taking its name from the place of the scribe’s monastery, Koridethi, in the Caucasus Mountains, near the Caspian Sea. Θ contains the Gospels; Matthew, Luke, and John have a text similar to most Byzantine manuscripts, but the text of Mark is similar to the type of text that Origen and Eusebius used in the 3rd–4th centuries, a Caesarean type. The manuscript is now in Tbilisi, capital city of the Republic of Georgia.