I want to know the answer to the following question:
Where was Polybius from?
All the background I'm provided with is that "The earliest and most credible surviving source for the Hellenistic period is Polybius of Megalopolis (c. 200-118), a statesman of the Achaean League until 168 BCE when he was forced to go to Rome as a hostage.". Is that enough to answer the question?
Answer: yes