The relations between these manuscripts were studied by Georg Waitz, who in 1876 identified 11 different families of the "Historia Langobardorum". The oldest manuscript is the Palimpsest of Assisi, written in the uncial script towards the end of the 8th century, almost immediately after Paul's work was completed. This palimpsest is, however, far from complete, as it contains only parts of books II and V of Paul's history. The earliest complete manuscript is the "Codex Sangallensis 635" written sometime between the 8th and the 10th centuries and designated by Waitz as F1. According to Waitz, F1's age makes it the most reliable of the "Historia"'s codices, a view which has been challenged by Antonio Zanella and Dante Bianchi, both of whom hold that the F1 does not correctly reflect Paul's original.