A, "the Venetian scholia", are most of the scholia of Venetus A, a major manuscript of the Iliad, dated to the 10th century, and located in the Biblioteca Marciana (Library of St. Mark's) of Venice. The sources of the scholia are noted at the end of each book. There are basically four. The hypothetical original text of the scholia, a manuscript of the 4th century CE, is therefore called, in German, the "Viermännerkommentar" (VMK), "four-man commentary", where the men are Aristonicus, Didymus, Herodian, and Nicanor. Their comments, and these scholia, are termed "critical". A-scholia are found in other manuscripts as well. Venetus A contains some bT scholia.