Question: What empire of Persia did the person who defeated the Agalassoi conquer?
Related documents: [0]  [DOC] The Agalassoi were a tribe that lived in modern Pakistan in the lower Indus Valley at the time of Alexander the Great. During Alexander's invasion of India, the Agalassoi were defeated in battle by the Macedonian army. [END] 
[1]  [DOC] The Indian campaign of Alexander the Great began in 326BC. After conquering the Achaemenid Empire of Persia, the Macedonian king (and now the great king of the Persian Empire), Alexander, launched a campaign into the Indian subcontinent. The rationale for this campaign is usually said to be Alexander's desire to conquer the entire known world, which the Greeks thought ended in India. [END] 
Answer: 
Achaemenid Empire
Achaemenid Empire