The two sources of the economic well being of Constantinople was the Taxes and trade at its port.
This was the area of the Roman empire that was referred to as the Byzantine area. This was the area that was under the rulership of Constantine at the time. They were a great trading area that used the trading of silk as a way of economic growth.
Hence we would say that The two sources of the economic well being of Constantinople was the Taxes and trade at its port.
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