In the East, the only change in the "omophorion" has been an increase in its width and a shift in the material from which it is made. The "omophorion" was documented about the year 400 AD as a liturgical vestment of the bishop in Isidore of Pelusium. It was made of wool and was already seen as symbolic of the duties of bishops as shepherds of their flocks. In the miniatures of an Alexandrian "Chronicle of the World", written probably during the fifth century, the "omophorion" was represented in an image. In later times, it was shown on the renowned ivory tablet of Trier, depicting the solemn translation of relics. Among the pictures dating from the seventh and eighth centuries, in which the "omophorion" is illustrated, are the lately discovered frescoes in "S. Maria, Antiqua" in the Roman Forum. The representation of the "omophorion" in these frescoes is essentially the same as the vestment in its present form.