Context: The migration-period peoples who later coalesced into a "German" ethnicity were the Germanic tribes of the Saxons, Franci, Thuringii, Alamanni and Bavarii. These five tribes, sometimes with inclusion of the Frisians, are considered as the major groups to take part in the formation of the Germans. The varieties of the German language are still divided up into these groups. Linguists distinguish low Saxon, Franconian, Bavarian, Thuringian and Alemannic varieties in modern German. By the 9th century, the large tribes which lived on the territory of modern Germany had been united under the rule of the Frankish king Charlemagne, known in German as Karl der Große. Much of what is now Eastern Germany became Slavonic-speaking (Sorbs and Veleti), after these areas were vacated by Germanic tribes (Vandals, Lombards, Burgundians and Suebi amongst others) which had migrated into the former areas of the Roman Empire.

Question: how many tribes are credited with the creation of the modern day germans?
Answer: five tribes

Question: In modern day what is still influenced by the  five tribes?
Answer: German language

Question: What king united the tribes in the 9th century? 
Answer: Charlemagne

Question: What part of Germany became mostly Slavonic-speaking due to migration?  
Answer: Eastern Germany

Question: The tribes that moved out of east Germany took to inhabit what fallen empires lands?
Answer: Roman Empire

Question: What five tribes are attributed with coalescing into a German ethnicity?
Answer: Saxons, Franci, Thuringii, Alamanni and Bavarii

Question: What 6th tribe is sometimes included with the original 5 German tribes?
Answer: Frisians

Question: Who united the 5 tribes?
Answer: king Charlemagne

Question: What century did King Charlemagne reign? 
Answer: 9th

Question: What modern ethnic group was formed by 6 migrating tribes?
Answer: Unanswerable

Question: Who was united in the 900's?
Answer: Unanswerable

Question: Who ruled the territory of modern Germany in the 900's?
Answer: Unanswerable

Question: Where did Slavonic tries migrate to from Eastern Germany?
Answer: Unanswerable