After the death of Samo, there was uncertainty about the Czech and Moravian lands, but after the rise of Charlamange of the Frankish Kingdom, Moravians were able to recover. The princes of Moravia consolidated their power, and one in particular Mojmir I, rose beyond tribal institutions to establish Great Moravia. After Mojmir I's deposition, his nephew Rostislav became Louis the German's loyal vassal. In secret, however, Rostislav had ambitions beyond this.
Samo and his Empire (631 – 658)
In the mid-seventh century, the "first Slavic State" came into existence, ruled by Samo, thus named Samo's Empire. It began with Samo as a Frankish merchant who aided the Slavs in their revolt against the ruling Avars. Samo was such a major contributor to the effort that he was chosen as the leader. The rest is history...