The gallery outside the refectory hosts a fresco about 20 meters in length, which presents a detailed account of John's Revelation. The most interesting element is the great emphasis put on this subject, both through its large size and its unusually central position in the monastery complex: It is the image most often seen, since it is on the way from the cathedral to the refectory and to the monks' cells. Including 21 scenes, this illustrated narrative of the Revelation is the earliest known work of such a long length in the history of Eastern Christian art, since it dates back to the middle of the 16th century. It follows the narrative structure of the text of the Revelation, quoting verses and emphasizing clarity and detail, as is the case today in an illustrated story or a graphic novel. Selected scenes will be discussed in detail below.