In 354 ce, the calligrapher Furius Dionysius Philocalus made a codex (extant only in copies) that contained the Roman calendar (Fasti; the only known 4th-cent. example), in addition to chronographical works, lists of consuls, bishops, and martyrs. The codex was a gift for the Roman Christian aristocrat Valentinus. The calendar contains a presumably current compilation of the emperor’s festivals, and dates for the cults of Cybele and Isis, but nothing from the calendar of Christian festivals.
Bibliography
T. Mommsen, Chronographus Anni CCCLIV, MGH.AA 9…