Rus'–Byzantine Treaty (911)

The Rus'–Byzantine Treaty of 911 is the most comprehensive and detailed treaty which was allegedly concluded between the Byzantine Empire and Kievan Rus' in the early 10th century. It was preceded by the preliminary treaty of 907. It is considered the earliest written source of Kievan Rus' law. The text of this treaty is only found in the Primary Chronicle (PVL), and its authenticity is therefore difficult to establish.