Harun al-Rashid
Domestically, Al-Rashid pursued policies similar to those of his father al-Mahdi. He released many of the  Umayyads and 'Alids his brother al-Hadi had imprisoned and declared amnesty for all political groups of the Quraysh. Large scale hostilities broke out with Byzantium, and under his rule, the Abbasid Empire reached its peak.