The first comet is mentioned by John Malala (tom. ii. p. 190, 219) and Theophanes (p. 154); the second by Procopius (Persic. l. ii. 4.). Yet I strongly suspect their identity. The paleness of the sun (Vandal. l. ii. c. 14) is applied by Theophanes (p. 158) to a different year.