The Abbasid Caliphate (Arabic: العبّاسيّون, al-‘Abbāsīyūn) is an Arab Dynasty of rulers, overthrowing the Ummayad Dynasty. It was built by the descendant of Muhammad's youngest uncle, Abbas ibn Abd al-Muttalib. It was created in Harran in 750 AD. and shifted its capital in 762 AD from Harran to Baghdad. Over the next two hundred years, it would reach its peak before collapsing again to the Fatimids in the West, and Mongols to the East. During the The Caliphate Wars it would make its comeback, making risky moves in order to justify its claim of being the head of world Muslim leadership.
11th Century Abbasids
By the mid 1020's the Abbasid Dynasty had re-established itself in the region, and started to make moves Against the Fatimids and the Byzantine Empire. Attacking the Byzantines however would be its mistake and Christian Europe, still feeling the effects of the First Crusade would start the Second against it, at this point led by Al-Qadir until his death in 1029 and continued under the reign of his son; Al-Qa'im. By the end of the war in 1053, the border lines between the two states would be marred by the creation of the Crusader States; which launched attacks and eventually capturing many frontier towns in the Remnant War.