Their conflict occurred in the 11th century.
Answer: When a political leader applies laws to the general populace that does apply to said leader
Explanation:
The Persian wars were fought against a foreign invader.
The Peloponnesian war was fought among Greeks.
Answer: The principle of "separate but equal"
Explanation: In the court case <em>Plessy v. Ferguson</em>, the doctrine of "separate but equal" was declared constitutional and legal, even under the Fourteenth Amendment.