The Fourth Fitna or Great Abbasid Civil War Military_operation resulted Causation from the conflict Hostile_encounter between the brothers al-Amin and al-Ma'mun over the succession Change_of_leadership to the throne of the Abbasid Caliphate .

The Fourth Fitna or Great Abbasid Civil War Military_operation resulted Causation from the conflict Hostile_encounter between the brothers al-Amin and al-Ma'mun over the succession Change_of_leadership to the throne of the Abbasid Caliphate .

The Battle Hostile_encounter of Anzen or Dazimon was fought Hostile_encounter on 22 July 838 at Anzen or Dazimon ( now Dazmana ( Akçatarla ) , Turkey ) between the Byzantine Empire and the forces of the Abbasid Caliphate .

The Sack of Amorium by the Abbasid Caliphate in mid-August 838 was one of the major events Social_event in the long history of the Arab–Byzantine Wars .

The Abbasid campaign was led Causation personally by the Caliph al-Mu'tasim ( reigned 833–842 ) , in retaliation Revenge to a virtually unopposed expedition launched Motion by the Byzantine emperor Theophilos ( r. 829–842 ) into the Caliphate 's borderlands the previous year .

The Battle Hostile_encounter of Tawahin ( , `` Battle Hostile_encounter of the Mills '' ) was fought Hostile_encounter in 885 between the forces of the Abbasid Caliphate under Abu ' l-Abbas ibn al-Muwaffaq ( the future Caliph al-Mu'tadid ) and the autonomous Tulunid ruler of Egypt and Syria , Khumarawayh .

Following Khumarawayh 's ascension Change_of_leadership to power in 884 , the Abbasid central government decided Deciding to reassert Recovering its control Control over the provinces ruled by him and invaded Attack northern Syria that year .

In the battle Hostile_encounter that followed , the Abbasid troops initially defeated Conquering the Tulunids and plundered Robbery Khumarawayh 's camp , but were then ambushed Attack by a Tulunid reserve force and routed Destroying in turn .

As a result of the battle Hostile_encounter , the Abbasid forces were forced Causation to withdraw Escaping from Syria , and Tulunid control Control over the province was reaffirmed .

In the following year the Abbasid government agreed Agree_or_refuse_to_act to a treaty Sign_agreement which formally recognized Agree_or_refuse_to_act Khumarawayh 's rule Control over both Egypt and Syria .

Under the Abbasid Empire , relations became Becoming more normal , with embassies exchanged Exchange and even periods of truce , but conflict Hostile_encounter remained the norm , with almost annual raids Attack and counter-raids , sponsored Supply either by the Abbasid government or by local rulers , well into the 10th century .

Under the Abbasid Empire , relations became Becoming more normal , with embassies exchanged Exchange and even periods of truce , but conflict Hostile_encounter remained the norm , with almost annual raids Attack and counter-raids , sponsored Supply either by the Abbasid government or by local rulers , well into the 10th century .

Only after 740 did they begin Process_start to launch Military_operation their raids Attack in an attempt to combat Military_operation the Arabs and take Conquering the lands they had lost , but still the Abbasid Empire was able to retaliate Defending with often massive and destructive Destroying invasions Attack of Asia Minor .

With the decline Cause_change_of_position_on_a_scale and fragmentation of the Abbasid state after 861 and the concurrent strengthening Cause_change_of_strength of the Byzantine Empire under the Macedonian dynasty , the tide gradually turned Becoming .

The Abbasid invasion Attack of Asia Minor in 782 was one of the largest operations Military_operation launched Process_start by the Abbasid Caliphate against the Byzantine Empire .

The Abbasid invasion Attack of Asia Minor in 782 was one of the largest operations Military_operation launched Process_start by the Abbasid Caliphate against the Byzantine Empire .

The invasion Attack was launched Process_start as a display of Abbasid military might in the aftermath of a series of Byzantine successes Achieve .

Commanded Control by the Abbasid heir-apparent , the future Harun al-Rashid , the Abbasid army reached Arriving as far as Chrysopolis , across the Bosporus from the Byzantine capital , Constantinople , while secondary forces Causation raided Attack western Asia Minor and defeated Conquering the Byzantine forces Causation there .

Commanded Control by the Abbasid heir-apparent , the future Harun al-Rashid , the Abbasid army reached Arriving as far as Chrysopolis , across the Bosporus from the Byzantine capital , Constantinople , while secondary forces Causation raided Attack western Asia Minor and defeated Conquering the Byzantine forces Causation there .

The Byzantines , who in the meantime had neutralized Preventing_or_letting the detachment left to secure Getting the Abbasid army 's rear in Phrygia , were able to trap Conquering Harun 's army between their own converging Come_together forces Causation .

The Abbasid prince sent Sending for a truce and detained Arrest the high-ranking Byzantine envoys , who included Cause_to_be_included Empress Irene 's chief minister , Staurakios .

Between 780–1180 , the Byzantine Empire and the Abbasid & Fatimid caliphates in the regions of Iraq , Palestine , Syria , Anatolia and Southern Italy fought Hostile_encounter a series of wars for supremacy in the Eastern Mediterranean .

The Abbasid Revolution was the overthrow of the Umayyad Caliphate ( 661–750 CE ) , the second of the four major Caliphates in early Islamic history , by the third , the Abbasid Caliphate ( 750–1258 CE ) .

The Abbasid Revolution was the overthrow of the Umayyad Caliphate ( 661–750 CE ) , the second of the four major Caliphates in early Islamic history , by the third , the Abbasid Caliphate ( 750–1258 CE ) .

The Abbasid family claimed Statement to have descended Becoming_a_member from al-Abbas , an uncle of the Prophet .