 Complete the following phrase:  In 623  according to the Chronicle of Fredegar  the Slavic tribes revolted against the oppression of the Avars. During this time, the Frankish merchant Samo allegedly came to the Czech lands with his entourage and joined with the Slavs to defeat the Avars. Thus the Slavs adopted Samo as their ruler. Later Samo and the Slavs came into conflict with the Frankish empire whose ruler Dagobert I wanted to extend his rule to the east. That led to the 