The SASSANID EMPIRE was defeated at the Battle of Nahavand and all of their territories were annexed by the Rashidun Caliphate.

Rashidun Caliphate was created in 632.

Rashidun al-Suri died in 1241.

Rashidun al-Suri was born in 1177.

Abu Bakr carried out the first conquests Rashidun Caliphate which was then expanded by his successor. He did not actually conquer any empires. He conquered mesopotamia (iraq) from the Persian (Sasanian) Empire, but not persia itself. He conquered Syria from the Byzantine Empire, but not the rest of this empire.