In AD 324, the final battle between Constantine I, Emperor of the West, and Licinius, Emperor of the East, in which Constantine defeated Licinius, took place at Chrysopolis. When Constantine made Byzantium his capital, Chrysopolis, together with Chalcedon, became suburbs. Chrysopolis remained important throughout the Byzantine period because all trade routes to Asia started there, and all Byzantine army units headed to Asia mustered there.
