“ In 323 Constantine, tempted by the “advanced age and unpopular vices” of his colleague, again declared war against him, and, having defeated his army at Adrianople (3rd of July 323) , succeeded in shutting him up within the walls of Byzantium. The defeat of the superior fleet of Licinius by Flavius Julius Crispus, Constantine’s eldest son, compelled his withdrawal to Bithynia, where a last stand was made ”