We have evidence conclusive that his Chronicle has been tampered with in this particular. The Gemblours MS., which was either written by Sigebert himself, or was a copy made from his, does not allude to Pope Joan. Several other early copies have not the passage. Guillaume de Nangiac, who wrote a Chronicle to the year 1302, transcribed, and absorbed into his work, the more ancient chronicle of Sigebert. The copy used by Guillaume de Nangiac must have been without the disputed paragraph, for it is not to be found in his work. We are therefore reduced to Martin Polonus (d. 1279), placing more than four centuries between him and the event he records.
The historical discrepancies are sufficiently glaring to make the story more than questionable.
Leo IV. died on the 17th July, 855; and Benedict III. was consecrated on the 1st September in the same year; so that it is impossible to insert between their pontificates a reign of two years, five months, and four days. It is, however, true that there was an antipope elected upon the death of Leo, at the instance of the Emperor Louis, but his name was Anastasius. This man possessed himself of the palace of the Popes, and obtained the incarceration of Benedict. However, his supporters
