the second son of Constantius Chlorus, and the first whom he had by his second wife, Theodora, was probably murdered by his nephew, the emperor Constantius. He is mentioned only by Zonaras (vol. i. p. 246, ed. Paris). There is much doubt respecting him, although it appears from Julianus (Epist. ad Pop. Athen. p. 497, ed. Paris), that Constantius put two uncles to death; so that we are forced to admit three brothers of Constantine the Great, one of whom, Hannibalianus, died before him, while his brothers Constantius and Constantinus survived him. The passage in Philostorgius (2.4) "Μετ οὐ πολὺν χρόνον afterr the empress Fausta was suffocated in a bath) ὑπὸ τῶν ἀδελφῶν φαρμάκοις κατὰ τὴν Νικομήδειαν διατρίβοντα ἀναιρεθῆναι" says clearly, that at the death of Constantine the Great there was more than one brother of him alive. [CONSTANTIUS II.]
[W.P]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