When I accessed the website of German rare book and manuscript dealer Dr. Jörn Gunther in June 2009 I found the following manuscript offered for sale under the heading, "The Oldest Western European Codex in Private Hands."
The history of the writing of this manuscript as understood through its palaeography described below. The texts which it contains, and the details of its provenance reflect significant aspects of Carolingian manuscript production, and the history of collecting medieval manuscripts. Here is Dr. Gunther's description:
"Canones conciliorum. Manuscript on vellum, written by an insular scribe. Northern Italy, c.775.
"223 x 175 mm. 94 leaves. Internally complete, lacking one gathering at the beginning and some leaves at the end. The quires are signed with Roman numbers from II-XIII.– Written space fol.1-64v:165 x 130 mm, on fol. 65-94v: 175 x 135 mm, ruled in blind for one column of 24-25 and 19-20 lines. fol. 1-60v written in half uncials and precarolingian minuscules, fol. 61-94v in precarolingian minuscules in olive grey, light brown and dark brown ink. Many capitals in uncial with simple decoration with penwork ornament, including one initial in a form of a fish.– In fine condition for a volume of such antiquity. Right upper corner on fol.70 torn away with some loss of text.– 19th-century brown morocco by the Parisian bookbinder Marcelin Lortic.
"1. The codex was written by an insular scribe from Ireland or Northumbria, working in Northern Italy.
2. Monastery of Reichenau in Germany (at an early date).
3. Bound in Paris by Marcellin Lortic who opened his shop in the Rue St Honoré in 1840.
4. Ms. 17.849 of the collection of Sir Thomas Phillipps (1792-1872); his oldest western manuscript and one of Phillipps's greatest treasures.
5. William Robinson Ltd., cat. 81: Precious Manuscripts, Historic Documents and Rare Books, London 1950, no. 92.
6. Dr. Martin Bodmer, Geneva, Switzerland (1899-1971).
7. Peter and Irene Ludwig, Aachen, ms.XIV 1 (1978-1983).
8. The J. Paul Getty Museum, Malibu (1983-1988).
9. Now: Private collection, Europe.
"fol.1-58: Canones Conciliorum– fol.58-77v: Symmachiana, so-called ‘Symmachian forgeries’– fol.77v-94v: Decretals of Siricius, Boniface I, Innocent I, Zosimus, and Celestine I; end of text missing. Following the death of Pope Gelasius I († 496) Dionysius Exiguus (c.470- c.555), a skythian monk in Rome, was commissioned by the papal court to compile the ‘Collectio Dionysiana’ which united the canons of the councils and papal decretals. This anthology was the first compilation of this kind carried out in the Western Church and forms the foundation of Western Latin canon law. The compilation of Dionysius exists in three editions of which the codex at issue represents the so-called ‘Dionysiana II’. Manuscripts of the ‘Dionysiana II’ are rare uncombined with other texts, while only one codex preserved as a complete book is of an earlier date: ms.fol.v.II.3 in St Petersburg (Rossijskaja Nacionalnaja Biblioteka), a Burgundian codex dating from the 7th century (CLA 11 no.1061). Apart from this manuscript only a fragment in the Biblioteca Amploniana in Erfurt (Ampl.2°74) can be dated earlier having been written during the second half of the 6th century, presumably in Italy.
"After the Canones Conciliorum there follows as an insert, which cannot be found in this form in comparable collections, the so-called ‘Symmachian forgeries’, dating from thetime of Pope Symmachus (498-514; see Landau 1998). He was elected pope after the death of Anastasius II by a certain faction; a second faction declared the archpriest Laurence as pontiff. As a result of the turmoil which followed the elections, the ‘Symmachian forgeries were written, which strove to demonstrate by means of fictitious papal case files that the pope would not be subject to a human court of justice, but solely to the judgment of God.
"The third component of the book comprises decretals compiled under the pontificate of Pope Hormisdas (514-523) and contains the complete corpus of the old canon law, which consisted of the decrees of the Middle Eastern, Greek, African and Roman councils as well as those of the popes. The compilation is known as the Sanblasianus edition, because it was edited on the basis of a manuscript which first belonged to St. Blasien in the Black Forest and then to St. Paul in Lavanttal (Stiftsbibliothek, cod.7/1). Only seven manuscripts of this edition are preserved, three of which are older than the present codex (Paris, BN, lat. 3836, dating from the second half of the 8th century; Cologne, Dombibliothek, ms.213 dating from the first third of the 8th century and the Sanblasianus, which also dates from the mid-8th century). The oldest manuscript within the group (Cologne, Dombibliothek, ms.213) was written in Northumbria and brought to Cologne in the 8th century.
"The Canones conciliorum gained such an importance in subsequent decades that the text was duplicated again and again in the Frankish empire and from this later period over 100 manuscripts are preserved in the Frankish area alone. The codex was written by three different scribes. The main scribe (fol.2-60v) wrote the Canones conciliorum as well as the opening of the ‘Symmachian forgeries’. Palaeographic analysis reveals that this scribe came to the continent from an insular scriptorium and finally settled in northern Italy. It is not ascertainable, however, in which northern Italian scriptorium the manuscript was written. The palaeographic indications cannot be used to date the manuscript to a specific year, but it is very likely that it was executed in the years around 775, making the present manuscript contemporary with the famous copy of the Canones compilation, the so-called Dionysio-Hadriana,which was presented to the Frankish ruler Charlemagne (768-814) by Pope Hadrian I (772-795) in Rome in 774. After the presentation, the wording of the statute book was made compulsory for the Frankish empire, and numerous transcripts of the codex, originally kept in Aachen and now lost, were produced."
Note: I reformatted the description somewhat for this database, and left out the bibliographical references cited at the end of Dr. Gunther's description. The hyperlinks are my additions.