structural:summarization, information:extraction, quality:correction
Medieval history

The south coast remained Greek in culture for almost two thousand years including under Roman successor states, the Byzantine Empire (341–1204 CE), the Empire of Trebizond (1204–1461 CE), and the independent Principality of Theodoro (ended 1475 CE). In the 13th century, some Crimean port cities were controlled by the Venetians and by the Genovese, but the interior was much less stable, enduring a long series of conquests and invasions. In the medieval period, it was partially conquered by Kievan Rus' whose prince was baptized at Sevastopol starting the Christianization of Kievan Rus'.