The Abbassids were ruled by Kings who styled themselves Caliphs (since all previous rulers of the Moslem Empires had done similarly. The First Abbassid Caliph is Abu Al-Abbas As-Saffah. He ruled from 750 CE to 754 CE and was succeeded by the Abbassid Al-Mansur (there is a different Umayyad Al-Mansur in Spain in the 900s).
abu al abbas al saffah
abbasu safah
The first Caliph was Abu Bakr Assidik.
Arabs first arrived in Palestine during Caliph Omar's invasion of the Levant in the 640s CE. Arabs were the dominant power in the region from then until the fall of the Abbassid Caliphate in the Levant in the 1100s.
The Umayyad Caliphate in Damascus was succeeded by Abbassid Family. Whereas Umayyad Caliphate in Cordoba ended without any successor when Hisham II, the final Caliph died.
Hülegü Khan, a grandson of Genghis Khan by his son Tolui, who led the conquest of the Persian and Abbassid Caliphates, destroying numerous cities and gaining a place of infamy among Middle Easterners. He founded the Ilkhanate, the Mongol Empire that ruled Persia, Mesopotamia, and eastern Anatolia for 1256-1335.
The Muslim rulers after prophet Muhammad death in year 632 AD were called Caliphs. The first Caliph was Abou Bakr. The Caliph after death of the Caliph Abou Bakr was Omar Ibn Al-Khattab. That is why he was the second Caliph.
It was ABD AR-RAHMAN III, Emir of Cordoba, who declared himself the Caliph of Cordoba on 16 January 929 C.E. This demonstrated the waning power of the Abbassid Caliphate in the Middle East and was an implicit argument that Andalus (southern Spain) was now the cultural and religious center of the Islamic World.
The first Rightly Guided Caliph Hazrat Abu Bakr Siddique RAU.
Hulagu Khan of the Mongols defeated Abbasid Caliph Al-Musta'sim in 1258 in Baghdad. He completely conquered the Abbassid Empire and made sure to raze every city to the ground that gave him one iota of resistance.
Abu Bakr
The Rashidun Caliphate (the Muslims), led by Caliph Omar, conquered the Levant in 634 C.E. The Rashidun Caliphate would control this territory until the rise of the Umayyad and Abbassid Caliphates. This control last over 300 years.
The Abbassid Caliphate does not represent a shift in the method of Islamic Leadership. The shift occurred between the last Rightly-Guided Caliph, 'Ali, and the first Umayyad Caliph, Mu'awiya. The position of Caliph shifted from being the person most devoted to the religion to a hereditary role, palaces and traditional trappings of imperial life took hold, and the Caliphate was firmly divided into wilayat (provinces) under the control of the wali'in (governors). The only major change in policy that occurred under the Abbassids was that Mawali (Non-Arab Muslims) were now equal to Arab Muslims in terms of rights and privileges.
Rashidun Caliphate was the 1st caliph to set out to conquer territory from Byzantines. This happened in the year 632.