Answer: The Senate awarded him the title.
Step-by-step explanation:
The Senate awarded Gaius Octavius Thurinus the title Augustus which meant "The illustrious One"because of his honorary actions in 27BCE
Gaius Octavius Thurinus was the adopted son of Julius Caesar which he took the name Gaius Julius Caesar after adoption and as stated in Ceaser's will.
Augustus, a Roman statesman and military leader was the first emperor of the Roman Empire, reigning from 27 BC till AD 14. His rule was known for peace and regarded as one of the most effective leaders in history.