 Complete the following phrase:  When Charibert and his son Chilperic were assassinated in 632, Dagobert had Burgundy and Aquitaine firmly under his rule, becoming the most powerful Merovingian king in many years and the most respected ruler in the West. In 631, Dagobert led a large army against Samo, the ruler of the Slavic Wends, partly at the request of the Germanic peoples living in the eastern territories and also due to Dagoberts quarrel with him about the Wends having robbed and killed a number of Frankish merchants. While Dagoberts Austrasian forces were defeated at the 