the mother of CRISPUS CAESAR, is usually termed by historians the first wife of Constantine the Great. However, Victor (Epit. 41) and Zosimus (2.20), both of whom mention her name, state expressly that she was his concubine, and their account is confirmed by Zonaras (13.2). To this direct testimony we can oppose nothing, except the improbability that Constantine should have marked out an illegitimate son as his successor. (Tillemont, Hist. des Empereurs, vol. iv. art. iv. p. 84, and Notes sur Constantin, note v.).
[W.R]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890