 Deanesly and Grosjean's thesis was successfully refuted by the textual work of Paul Meyvaert, following whose work most scholars have come to accept the Libellus as a genuine letter of Gregory. The only portion of the Libellus that Meyvaert could not accept as genuine was the chapter on marriage, which Meyvaert (like Boniface before him) believed could not have been written by Gregory. Meyvaert therefore pronounced this chapter to be the single interpolation in an otherwise genuine document. All subsequent scholarship up until the year 2008 has followed him on this point. In 2008 Ubl not only showed that the marriage chapter was in fact authored by Gregory, but he also explained exactly how it was the Boniface and later historians came to misunderstand its meaning.
