The control of the estuary (known in East Slavic sources as "Beloberezhye", or White Shores) was disputed between Kievan Rus and Byzantium during the multiple Rus'–Byzantine Wars. At last the Rus'–Byzantine Treaty of 944 stipulated that the Rus' could use the island in the summertime, without establishing winter camps in the estuary or oppressing the citizens of Chersonesos fishing off shore. Nevertheless, at the conclusion of Svyatoslav I's war against Byzantium, this overking of Rus was allowed to evacuate his forces from Dorostolon to Beloberezhye, where his troops spent the hungry winter of 971/972.