Kings and Generals historical animated documentary series on the history of medieval era continues with a video on the medieval origins of Ukrainians. Previously, we explored how the identity of Ukraine as a nation starting forming with the Kyivan Rus and the kingdom of Ruthenia, and about the Mongol period. This new video will describe the fall of the Mongol rule over the lands of Ukraine, how the Polish-Lithuanian Commonwealth took over and how these events led to the Rise of the Cossacks. We will also talk about the Bogdan Khmelnytsky's rebellion.