In what century did the first trade of the Byzantine Empire appear?

The trade relations of the Byzantine Empire began to develop from the early days of the Eastern Empire, that is, in 395, when the Roman Empire was divided into two parts. The Byzantine Empire was once one of the world’s most important trade centers. All the wealth of the east and west flocked there. In addition, trade relations of Byzantium expanded to the northern regions, beyond the Black Sea. There, her main trading partner was Russia, which supplied Constantinople with goods rare for the south.