By 313, there were two remaining
augusti in control of the Roman Empire—Constantine in the west and his brother-in-law
Licinius in the east. On 1 March 317, the two co-reigning
augusti jointly proclaimed three new
caesares: Crispus, alongside his younger half-brother
Constantine II, and his first cousin
Licinius Junior. Constantine appointed Crispus as Commander of Gaul. The new
caesar soon held residence in Augusta Treverorum (modern
Trier), regional capital of
Germania. By October 322, Crispus was already married to a woman named Helena, as she had a child with him, a son Flavius, in that month. The
Codex Theodosianus recorded Constantine’s celebration of the event. Crispus was leader in victorious military operations against the
Franks and the
Alamanni in 318, 320 and 323. Thus he secured the continued Roman presence in the areas of Gaul and Germania. The soldiers adored him thanks to his strategic abilities and the victories to which he had led the
Roman legions. Crispus spent the following years assisting Constantine in the war against by then hostile Licinius. In 324, Constantine appointed Crispus as the commander of his fleet which left the port of
Piraeus to confront Licinius' fleet. The subsequent
Battle of the Hellespont was fought at the straits of
Bosporus. The 200 ships under the command of Crispus managed to decisively defeat the enemy forces, which were at least double in number. Thus Crispus achieved his most important and difficult victory which further established his reputation as a brilliant general. Following his navy activities, Crispus was assigned part of the legions loyal to his father. The other part was commanded by Constantine himself. Crispus led the legions assigned to him in another victorious
battle outside Chrysopolis against the armies of Licinius. The two victories were his contribution to the final triumph of his father over Licinius. Constantine was the only
augustus left in the Empire. He honoured his son for his support and success by depicting his face in imperial coins, statues, mosaics, cameos, etc. Eusebius of Caesaria wrote for Crispus that he is "an
Imperator most dear to
God and in all regards comparable to his father,” going as far as to compare their relationship to God the Father and God the Son. ==Execution==