<P> One of the economic foundations of the empire was trade . Constantinople was located on important east - west and north - south trade routes . Trebizond was an important port in the eastern trade . The exact routes varied over the years with wars and the political situation . Imports and exports were uniformly taxed at ten percent . </P>
<P> One of the economic foundations of the empire was trade . Constantinople was located on important east - west and north - south trade routes . Trebizond was an important port in the eastern trade . The exact routes varied over the years with wars and the political situation . Imports and exports were uniformly taxed at ten percent . </P>
how did constantinople serve as a center of trade
how did constantinople serve as a center of trade
located on important east - west and north - south trade routes
located on important east - west and north - south trade routes