The Rus'–Byzantine War of 907 is associated in the Primary Chronicle with the name of Oleg of Novgorod. The chronicle implies that it was the most successful military operation of the Kievan Rus' against the Byzantine Empire. The threat to Constantinople was ultimately relieved by peace negotiations which bore fruit in the Russo-Byzantine Treaty of 907. Pursuant to the treaty, the Byzantines paid a tribute of twelve grivnas for each Rus' boat.