I want to know the answer to the following question:
What invading marauders caused havoc in the Balkans during the 4th century.
All the background I'm provided with is that "The raids and devastation of the Goths and Huns in the 4th and 5th centuries and the Slavic invasion of Greece in the 7th century resulted in a dramatic collapse in imperial authority in the Greek peninsula.". Is that enough to answer the question?
Answer: no