Threats to the Byzantine Empire (Edexcel A-Level History): Revision Notes

Threats to the Byzantine Empire

The Byzantine Empire in the 1090s

By 1095, the Byzantine Empire faced serious military challenges that threatened its very survival. The Byzantine Empire was the eastern portion of the Roman Empire that had endured after the collapse of the Western Roman Empire. In the 11th century, it controlled substantial territories including Greece, Bulgaria, Macedonia and Asia Minor. The empire's magnificent capital, Constantinople, served as both a political center and the heart of the Greek Orthodox Christian Church.

The empire was ruled by Emperor Alexius I Comnenus, who had seized power in 1081. Although the Greek Orthodox Church had separated from the Latin Church in the West during the Great Schism of 1054, relations between the two branches of Christianity had begun to improve by the 1090s. This improving relationship would prove crucial for Alexius when he desperately needed help from Western Europe.

The Seljuk Turkish threat

The most immediate and dangerous threat to the Byzantine Empire came from the Seljuk Turks, who had been systematically conquering Byzantine territories in Asia Minor. This Muslim expansion posed an existential threat to the empire:

• 1078: The Seljuks captured Nicaea, bringing Muslim forces to within just 100 kilometres of Constantinople itself. This proximity made the threat feel immediate and personal to the Byzantine population.

• 1084: The powerful and strategically important city of Antioch fell to the Seljuks. They seized it from Philaretus, a former Byzantine general, demonstrating that even experienced military leaders could not hold back the Turkish advance.

• 1090: The entire region of Asia Minor came under the control of a single Seljuk ruler, Suleyman. This unification of Muslim forces under one strong leader made the threat even more formidable.

The progressive loss of Asia Minor was catastrophic for the Byzantine Empire. These territories provided vital resources, military recruits and a defensive buffer zone. Without intervention, Constantinople itself faced the real prospect of falling to a Muslim invasion, which would mean the end of the Byzantine Empire and Greek Orthodox Christianity in the region.

Alexius I Comnenus: a ruler under pressure

Alexius I Comnenus (1057-1118) was far from being a weak ruler, but he faced overwhelming challenges on multiple fronts. He had come to power through rebellion in 1081, overthrowing the previous emperor and seizing the throne. To protect his position, he strategically placed family members in key government roles, creating a network of loyalty.

However, Alexius's reign was marked by constant threats beyond just the Turkish menace:

• The Normans, including Bohemond of Taranto, had launched attacks on the western Balkans between 1081 and 1083, forcing Alexius to fight on two fronts simultaneously.

• The empire suffered severe financial problems, particularly the debasement of Byzantine coinage. This economic crisis stemmed from the enormous costs of hiring mercenaries to defend the empire's borders.

• Alexius needed military success to achieve multiple objectives: defending his territorial borders, restoring his treasury, and maintaining his grip on domestic power against potential rivals.

A successful military campaign, like what would become the First Crusade, offered Alexius the opportunity to address several of these problems simultaneously. He could reclaim lost territories, reduce the need for expensive mercenaries, and strengthen his political position through victory.

Alexius's response: diplomatic strategy and failure

Despite the military pressures, Alexius I attempted to tackle the Seljuk threat through diplomatic negotiation rather than immediate warfare. During the 1090s, he initiated talks with Abu'l-Kasim, the Seljuk leader controlling Nicaea, hoping to negotiate an agreement that would restore Byzantine control over this crucial city.

This diplomatic approach reflected Alexius's pragmatic understanding that he lacked the military resources to simply reconquer lost territories by force. However, his diplomatic strategy collapsed when Abu'l-Kasim was murdered. His successor, Kilij Arslan, proved far less willing to negotiate and completely refused to discuss any agreement with Alexius.

This diplomatic failure left Alexius in a desperate position, with no peaceful means of recovering Nicaea and no military capacity to take it by force. The situation demanded a new approach, one that would require external assistance.

Multiple threats converging

The challenge from the Seljuk Turks, severe as it was, represented only one of several simultaneous threats facing the Byzantine Empire in the mid-1090s:

Muslim pirate attacks: In 1094, Muslim pirates launched seaborne raids on the islands in the Aegean Sea. These attacks threatened Byzantine maritime trade, coastal settlements and naval supremacy in the region. The raids demonstrated that the Muslim threat came not only from the land borders but also from the sea, stretching Byzantine defences even thinner.

The Cuman invasion: The Cumans, another nomadic Turkish tribe, posed an additional danger to the empire. In 1095, they launched an invasion that reached Adrianople within the Byzantine Empire itself. This attack opened yet another front, forcing Alexius to worry about threats from multiple directions simultaneously.

These converging threats created a crisis situation where the Byzantine Empire faced enemies on land and sea, from the east and potentially from the north. Alexius could not possibly defend against all these threats using only his own resources. External military assistance had become not just desirable but absolutely necessary for the empire's survival.

Alexius I's appeal to Pope Urban II

The escalating threat level in 1095 pushed Alexius I to make a direct appeal for help to Pope Urban II, the leader of the Latin Church in Western Europe. As the representative of Greek Orthodox Christianity, Alexius reached out across the religious divide that had separated the two Churches since 1054.

What Alexius wanted: It is crucial to understand that Alexius did not request a crusade. Instead, he wanted the type of professional military assistance he had previously received in 1090, when Robert I, Count of Flanders, had sent 500 Western knights to help fight the Turks. Alexius hoped to recruit a similar force of professional soldiers who would serve under Byzantine command and help him:

• Reclaim Nicaea and bring it back under Byzantine control
• Create a defensive buffer zone between his empire and the Seljuk Turks
• Bolster his existing army without the expense of hiring more mercenaries

The Council of Piacenza: In early 1095, Alexius sent envoys to a major Church Council held by Pope Urban II in the Italian city of Piacenza. At this gathering of Church leaders, Alexius's representatives made their case for Western military assistance. Importantly, they framed the request as help to defend Christianity itself, not merely as a response to recent military defeats. They emphasized the growing threat Muslims posed to the Church, making it a religious as well as political issue.

The chronicler Bernold of Constance recorded that Pope Urban II responded positively to this appeal. The pope asked those present at the council to promise their help to the Byzantine Empire. Many attendees took oaths swearing to journey to Constantinople and provide assistance to Alexius to the best of their abilities.

The political trigger for a religious war: Alexius's appeal provided Urban II with a political justification and trigger to begin formulating his plans for what would become the First Crusade. The threat to an eastern Christian ally gave Urban the opportunity to launch a religious war that would go far beyond what Alexius had requested. A political need—defending the Byzantine Empire—had thus sparked the idea for a much larger religious military expedition.

Primary source evidence: Bernold of Constance

The contemporary chronicler Bernold of Constance provides valuable historical evidence for Alexius's appeal at the Council of Piacenza in March 1095. His account offers important insights into how contemporaries understood and recorded these events.

According to Bernold's description, envoys from the "Constantinopolitan emperor" (Alexius I) came to the Church Council and "humbly implored" Pope Urban II and "all the faithful of Christ" to provide help against the "pagans" (Muslims). The appeal emphasized that Muslim forces threatened "the defence of the holy church" and had "almost annihilated" Christianity in these regions, occupying territories right up to the walls of Constantinople itself.

Bernold recorded that Pope Urban II actively encouraged many men to offer assistance. Those who agreed took solemn oaths promising to journey to the Byzantine Empire and provide help to Alexius "to the best of their ability" with "God's help."

This source demonstrates several key points:

• Alexius's appeal was public and formal, made at a major Church gathering
• The appeal emphasized the threat to Christianity, not just political concerns
• Urban II responded enthusiastically and encouraged widespread participation
• Those who agreed made religious oaths, suggesting sacred commitment
• The language used framed this as defending the Church, laying groundwork for crusading ideology

The source shows how a political request for military assistance was transformed into a religious cause that would inspire thousands to take up arms in what became the First Crusade.