The British usurpers are taken from Zosimus (1. vi [c. 2] p. 371-375), Orosius (1. vii. v. 40, p. 576, 577), Olympiodorus (apud Photiurn, p. 180, 181 [p. 57, ed. Bekker]), the ecclesiastical historians, and the Chronicles. The Latins are ignorant of Marcus.