Mutazilah was an Islamic school of speculative that flourished in the 10th centuries, where is flourished?

Mutazilah was an Islamic school of speculative that flourished in the 10th centuries, where is flourished?

Explanation

Muʿtazila is a rationalist school of Islamic theology that flourished in the cities of Basra and Baghdad, both now in Iraq, during the 8th to the 10th centuries CE.

The Mu'tazilites were celebrated during the Islamic Golden Age