As Marwan II was focused on his conquests in India, another dynasty emerged in Baghdad, the Abbasids. When the aging Caliph was visiting Baghdad in 1223AD, he died under suspicious circumstances. The Umayyad clan was in disarray and the Abbasids quickly overthrew them with precise attacks against the members of the Umayyad clan. Eventually the Abbasids claimed the Caliphate to themselves and Abu al-Abbas Abdu'llah as-Saffāh ibn Muhammad ibn Ali ibn Abdullah ibn Abbas ibn Abdul Muttalib ibn Hashim, also known as Al-Saffah, become the new Caliph of Arabia.
Al-Saffah continued Arabia's expansions in India and the city of Dhaka was claimed from Para Empire after a ruthless attack by the notorius Phoenician mercenaries supported by the Afgan Riders.
Al-Saffah also allowed the attack against the Ghorids to continue. However, the narrow mountain passes were filled with ambush opportunities and many Camel Riders Regiments were lost. Nontheless after nearly decade of fighting on the Afgani Highlands the Arabian Omani Riders managed to crush the main Ghorid Army, lead by Mohammad Ghori himself, outside the city of Kabul. The Ghori resistance was broken and Afganistan was attached to the Caliphate.
The Arabian Caliphate now reached from the Pyrenees to the Bay of Bengal. However the Caliphate faced many threats and especially the distant parts of it, like Tunis, were under continuous attacks. Al-Saffah focused to strenghten Arabian garrisons in order to maintain the Caliphate under Abbasid control.
Al-Saffah passed away peacefully in 1257AD and was successed by Abu Ja'far Abdallah ibn Muhammad al-Mansur.
However, in 1270AD the Turkish peoples in Anatolia formed an Ottoman Empire and attached the old Babylonian City States into it and conquered the old Eastern Roman capital of Byzantion. The Arabian Caliphate now faced a new thread much closer to her heartlands than ever before. In order to encounter this new thread Al-Mansur signed a peace treaty with the Para Empire.