Lactantius

“ The ambassadors were received courteously, friendship established, and in token of it the effigies of Maxentius and Daia were placed together in public view. Maxentius willingly embraced this, as if it had been an aid from heaven; for he had already declared war against Constantine, as if to revenge the death of his father Maximian. From this appearance of filial piety a suspicion arose, that the detestable old man had but feigned a quarrel with his son that he might have an opportunity to destroy his rivals in power, and so make way for himself and his son to possess the whole empire. ”