Answer:
He treated his subjects with fairness to create a strong empire.
Step-by-step explanation:
Cyrus the Great was the founder of the Achaemenid Empire, the first Persian Empire. He created the greatest empire of the world until these days.
After his conquest, Cyrus respected the customs and religions of the lands he conquered. It worked out as a very successful model for centralized administration and establishing a government,
I hope this answer helps you.