 Many historians support the theory of a further wave of Slavs coming from the south during the first half of the 7th century.They fought with neighboring Avars until the rise of the empire of Samo (see below).According to the Chronicle of Fredegar, some of the Slavs living on what is now Czech territory, mainly in southern Moravia, were exposed for a number of years to violence and marauding raids from the Avars, whose empire stretched across the territory of present-day Hungary.