What did Medes and Persians have in common?

The Medes and Persians were both ancient Iranian peoples who inhabited the region known as Persia (modern-day Iran). They shared linguistic, cultural, and religious similarities, including the use of the Old Persian language and the worship of similar deities. Additionally, both groups played significant roles in the formation of the Achaemenid Empire, with the Medes initially establishing a powerful empire that was later unified and expanded by the Persians under Cyrus the Great. Their eventual alliance and integration led to a dominant political and cultural force in the ancient world.