Final answer:
The Persian Wars were started by the Athenians supporting a rebellion against the Persians.
Step-by-step explanation:
The Persian Wars were started by the Athenians supporting a rebellion against the Persians. In 499 BCE, several Ionian Greek city-states revolted against Persian rule and received aid from Athens. This angered the Persians, particularly King Darius, who decided that Athens must be punished, leading to the start of the Persian War.