Title: Alps.
Question: By the 19th century what was common in the Alpine regions?

Title: Iran.
Question: The Achaemenid Empire was the known enemy of what nation's histories during its existence?

Title: Han dynasty.
Question: Which individual held the responsibility to oversee the interactions of the empire's nobles with the court?

Title: Tajikistan.
Question:
What was the name of the region when it was the cultural center of Iran?