Answer
Mu'awiya appointed Al-Mughira ibn Shu'ba and Ziyad ibn Abi Sufyan as his powerful governors in Iraq and the Hijaz respectively, giving them the authority to make decisions and execute policies on his behalf. Al-Mughira was a skilled administrator and diplomat, while Ziyad was a ruthless and ambitious military commander. Under their leadership, the Umayyad caliphate expanded rapidly and became one of the most powerful empires in the world.