Hiệp ước Rus' – Byzantine

The Rus'–Byzantine Treaty, between the Byzantine emperor Constantine VII and Igor I of Kiev, was concluded either in 944 or 945. It was a result of the Rus'-Byzantine War of 941 undertaken by Kievan Rus' against Constantinople. Its provisions were less advantageous for the Rus' than those of the previous treaty, associated with the name of Igor's predecessor Oleg. It was one of the earliest written sources of Kievan Rus' law.

The text of the treaty, as preserved in the Primary Chronicle, contains agreements regarding the Rus' promise not to attack Chersonesos, a Byzantine exclave in the Crimea (Article 8). The mouth of the Dnieper River (Beloberezhye) was to be administered jointly, although the Rus' were forbidden to winter there and to oppress fishers from Chersonesos (Article 12). Article 2 of the treaty contains provisions on maritime law. In order to distinguish peaceful merchants from raiders, each ship of the Rus' was to bear a charter of the Kievan prince, explaining how many people and how many ships would sail to Constantinople. Otherwise, the Rus' ships might be apprehended by the imperial authorities.