The decline of Constantinople – a main trading partner of <answer>Kiev</answer>an Rus' – played a significant role in the decline of the <answer>Kiev</answer>an Rus'. The trade route from the Varangians to the Greeks, along which the goods were moving from the Black Sea (mainly Byzantine) through eastern Europe to the Baltic, was a cornerstone of <answer>Kiev</answer> wealth and prosperity. <answer>Kiev</answer> was the main power and initiator in this relationship, once the Byzantine Empire fell into turmoil and the supplies became erratic, profits dried out, and <answer>Kiev</answer> lost its appeal.[citation needed]
Which terrirory was the main power in this trade relatinship?
Kiev