The Byzantine–Bulgarian war Military_operation of 894–896 ( ) , also called Name_conferral the Trade war Military_operation ( ) , was fought Competition between the Bulgarian Empire and the Byzantine Empire as a result Causation of the decision of the Byzantine emperor Leo VI to move Removing the Bulgarian market from Constantinople to Thessaloniki which would greatly increase Cause_change_of_position_on_a_scale the expenses Cost of the Bulgarian merchants .

The Byzantine–Bulgarian war Military_operation of 894–896 ( ) , also called Name_conferral the Trade war Military_operation ( ) , was fought Competition between the Bulgarian Empire and the Byzantine Empire as a result Causation of the decision of the Byzantine emperor Leo VI to move Removing the Bulgarian market from Constantinople to Thessaloniki which would greatly increase Cause_change_of_position_on_a_scale the expenses Cost of the Bulgarian merchants .

Following the defeat Conquering of the Byzantine army in the initial stages of the war Military_operation in 894 Leo VI sought Getting aid Assistance from the Magyars who at the time inhabited Placing the steppes to the north-east of Bulgaria .

Aided Assistance by the Byzantine navy , in 895 the Magyars invaded Attack Dobrudzha and defeated Conquering the Bulgarian troops .

With the Magyar threat eliminated Removing , Simeon led his hosts south and routed Attack the Byzantine army in the battle Hostile_encounter of Boulgarophygon in the summer of 896 , which forced Causation Byzantium to agree Agree_or_refuse_to_act to the Bulgarian terms .

The Byzantine Empire was obliged Request to pay Commerce_pay Bulgaria an annual tribute in exchange Exchange for the return Arriving of captured Byzantine soldiers and civilians .

The Byzantine Empire was obliged Request to pay Commerce_pay Bulgaria an annual tribute in exchange Exchange for the return Arriving of captured Byzantine soldiers and civilians .

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 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 .

As a result Causation , the uprising was repulsed Defending and the emperor entered Arriving Bulgaria , which remained a Byzantine province until 1185 .

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 .

After a period of indecisive and slow border warfare , a string of almost unbroken Byzantine victories in the late 10th and early 11th centuries allowed Preventing_or_letting three Byzantine Emperors , namely Nikephoros II Phokas , John I Tzimiskes and finally Basil II to recapture Conquering territory lost Earnings_and_losses to the Muslim conquests in the 7th century Arab–Byzantine wars under the failing Rewards_and_punishments Heraclian Dynasty .

After a period of indecisive and slow border warfare , a string of almost unbroken Byzantine victories in the late 10th and early 11th centuries allowed Preventing_or_letting three Byzantine Emperors , namely Nikephoros II Phokas , John I Tzimiskes and finally Basil II to recapture Conquering territory lost Earnings_and_losses to the Muslim conquests in the 7th century Arab–Byzantine wars under the failing Rewards_and_punishments Heraclian Dynasty .

Byzantine attempts to stem Preventing_or_letting the slow but successful Arab conquest Conquering of Sicily ended Process_end in a dismal failure .

Syria would cease Process_end to exist Presence as a Byzantine province when the Turks took Conquering the city of Antioch in `` c '' .

The Crusaders took Conquering the city back for Christendom in 1097 but a Byzantine protectorate was established Creating over the Crusader Kingdoms in Jerusalem and Antioch under Manuel I Komnenos .

The Byzantine–Seljuq Wars were a series of decisive battles Hostile_encounter that shifted Change the balance of power in Asia Minor and Syria from the Byzantine Empire to the Seljuqs .

Today , the Battle Hostile_encounter of Manzikert is widely seen Perception_active as the moment when the Byzantines lost Earnings_and_losses the war against the Turks ; however the Byzantine military was of questionable quality before 1071 with regular Turkish incursions overrunning Destroying the failing theme system .

Even after Manzikert , Byzantine rule over Asia Minor did not end Process_end immediately , nor were any heavy concessions levied Imposing_obligation by the Turks on their opponents – it took Conquering another 20 years before the Turks were in control Control of the entire Anatolian peninsula and not for long either .

Crusader assistance to the Byzantine Empire was mixed Cause_to_amalgamate with treachery and looting Robbery , although substantial gains Getting were made Getting in the First Crusade .

Ironically , the besieging Besieging army included Cause_to_be_included a contingent from the Byzantine Empire , which by then was a vassal of the Ottomans .

In theory , the city was under the Byzantine Empire , but cut off Having_or_lacking_access by a sea of hostile land ensured Preventing_or_letting that in reality the city remained Presence independent .

In 1378 Manuel II Palaiologos promised Commitment to hand over Giving the city of Philadelphia to the Turks in return for the Ottoman sultan 's aid Assistance in a disastrous Catastrophe Byzantine civil war .

The Siege of Syracuse in 827–828 marks the first attempt by the Aghlabids to conquer Conquering the city of Syracuse in Sicily , then a Byzantine province .

The Aghlabid army had only months before landed on Sicily , ostensibly in support Supporting of the rebel Byzantine general Euphemius .

After defeating Conquering local forces and taking Conquering the fortress of Mazara , they marched Self_motion on Syracuse , which was the capital of the island under Roman and Byzantine rule .

In the face of Byzantine reinforcements , the new Arab leader , Muhammad ibn Abi ' l-Jawari , abandoned GiveUp the siege Besieging and withdrew Escaping to the southwestern part of the island , which remained in their hands .

In 615 , during the ongoing war with the Byzantine Empire , the Sassanid Persian army under spahbod Shahin invaded Attack Asia Minor and reached Arriving Chalcedon , across the Bosporus from Constantinople .

After negotiations Communication with Byzantine Emperor Heraclius , a Byzantine ambassador was sent Sending to Persian Shahanshah Khosrau II , and Shahin withdrew Escaping again to Syria .

After negotiations Communication with Byzantine Emperor Heraclius , a Byzantine ambassador was sent Sending to Persian Shahanshah Khosrau II , and Shahin withdrew Escaping again to Syria .