The Chronography of 354, also known as the Calendar of 354, was a 4th-century illuminated manuscript, which was produced in 354 AD for a wealthy Roman Christian named Valentinus. It is the earliest dated codex to have full page illustrations. None of the original has survived. The term Calendar of Filocalus is sometimes used to describe the whole collection, and sometimes just the sixth part, which is the Calendar itself. Other versions of the names (“Philocalus”, “Codex-Calendar of 354”) are occasionally used. The text and illustrations are available online.[1] Amongst other historically significant information, the work contains the earliest reference to the celebration of Christmas as a holiday or feast.