 
 <prompt> Wetin carry the princes comot from Black Sea? Based on di last question, write small tori wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: Relations between the Rus' and Byzantines don dey more complex afta Oleg take control over Kiev, wey dey show commercial, cultural, and military wahala. The wealth and income of the Rus' dey heavily depend on trade with Byzantium. Constantine Porphyrogenitus describe how the princes of Kiev dey take collect tribute from client tribes, gather plenty goods for hundreds of boats, carry am down the Dnieper go Black Sea, then sail go the estuary of the Dniester, the Danube delta, and finally reach Constantinople. Dem dey carry silk fabrics, spices, wine, and fruit come back. The importance of this trade relationship dey lead to military action when wahala show face. The Primary Chronicle talk say the Rus' attack Constantinople again for 907, most likely to secure trade access. The Chronicle dey praise the military strength and smartness of Oleg, with plenty legendary tori. Byzantine sources no mention the attack, but two treaties for 907 and 911 outline trade agreement with the Rus', the terms dey show say the Byzantines dey under pressure, as dem give the Rus' space and supplies for their traders and tax-free trading rights for Constantinople. 