Prince Alexius’s Plan for the Crusade (Edexcel A-Level History): Revision Notes
Prince Alexius's Plan for the Crusade
Background: the crusade stalls again
By late 1202, the Fourth Crusade had stalled once more. The crusading armies were camped outside Zara, waiting for winter to pass before they could continue their journey. It was during this period of delay that a new figure emerged with an extraordinary proposal that would fundamentally change the direction of the crusade.
The Fourth Crusade had already experienced significant delays and diversions by this point. The stop at Zara represented another deviation from the crusade's original mission to reach the Holy Land, setting the stage for even more dramatic changes to come.
Who was Prince Alexius?
Prince Alexius Angelus was the son of Isaac II, the former Byzantine emperor. His story began with a family betrayal that had significant consequences for the Byzantine Empire and ultimately for the Fourth Crusade itself.
The coup of 1195
In 1195, Isaac II was overthrown in a dramatic coup. His own brother deposed him and had him blinded—a deliberate act, since Byzantine law prevented a blind person from ruling as emperor. The usurper then took power as Alexius III. Both Isaac II and his son, Prince Alexius, were placed under house arrest. Alexius III believed his position was secure, assuming that Isaac's blindness and their imprisonment would prevent any challenge to his authority.
Byzantine Succession Law
The blinding of Isaac II was not merely an act of cruelty—it was a calculated political move. Byzantine law explicitly prevented blind individuals from ruling as emperor, making this a permanent solution to eliminate Isaac II as a rival. This legal restriction was well-known and commonly used in Byzantine power struggles.
Isaac II Angelus: context
Isaac II had become Byzantine emperor in September 1185, following the murder of his predecessor, Andronicus I. As emperor, Isaac II proved to be a relatively weak ruler compared to earlier Byzantine emperors. He struggled to enforce his authority across the empire and faced several challenges:
- He failed to control Isaac Comnenus, the ruler of Cyprus, before the island was conquered by Richard I during the Third Crusade
- He pursued anti-western policies, making him an unlikely future ally of the Fourth Crusaders
- He fought against the Normans after their invasion of Thessalonica
- He attempted to form an alliance with Saladin to protect himself from the Third Crusade forces led by Frederick Barbarossa
Isaac II's anti-western policies and alliance attempts with Saladin demonstrate the complex political landscape of the time. His actions created tensions with western powers that would ironically lead to his son seeking help from those same western forces years later.
Towards the end of his life, Isaac II would be deposed twice—first by Alexius III in 1195, and later by Murtzuphlus in 1204. He died in a prison cell shortly after his son's death in February 1204.
Prince Alexius's escape and preparations
Despite Alexius III's precautions, the emperor had underestimated the ingenuity of young Prince Alexius. By 1201, the prince had managed to escape from imprisonment with the help of allies from Pisa. Once free, he headed west and began seeking support at the courts of western Europe. His goal was to restore his father to the imperial throne of Constantinople.
Constantinople's military situation
Prince Alexius's proposal had some realistic prospects of success for several reasons. The Byzantine capital presented both vulnerabilities and formidable defenses that would shape the strategic calculations of all parties involved.
Constantinople's Strategic Position in 1203
Weaknesses:
- The city's walls were in poor condition, making them vulnerable to sustained assault
- The naval fleet consisted of only 20 old ships, leaving the city exposed to naval attack
- This naval weakness was particularly significant given Constantinople's coastal position
Strengths:
- An impressive standing army of 30,000 troops, representing substantial defensive capability
- A contingent of Varangian guards—elite warriors with a distinguished reputation for their military skills and fierce loyalty
Given these circumstances, Prince Alexius needed to recruit a substantial military force if he was to have any hope of reversing the events of 1195 and restoring his father to power.
The intervention of Prince Alexius: his proposal
In December 1202, Prince Alexius made his appeal to the crusaders through an important intermediary: Philip of Swabia. Philip was the German king and emperor of the western (Holy Roman) Empire, and he had a close personal connection to Prince Alexius—he was married to the prince's sister, Irene Angelus.
Philip sent an envoy to Zara on behalf of his brother-in-law with a proposal that offered the crusaders a way to strengthen the Fourth Crusade. The plan asked for the crusaders' help to restore Isaac II to the Byzantine throne and crown Prince Alexius as co-emperor. In return, they would either intimidate Alexius III into submission or use military force to retake Constantinople.
What Prince Alexius offered
The Extraordinary Promises
Prince Alexius made four major commitments that were remarkable in their scope:
- 200,000 marks in financial support—an enormous sum that would solve the crusade's financial crisis
- 10,000 troops to join the Fourth Crusade for the campaign in the Holy Land—more than tripling the crusade's military strength
- Payment for 500 knights who would defend Outremer (the crusader states in the Holy Land) for the entire lifespan of Prince Alexius—providing long-term security
- To bring the eastern Christian Church of Byzantium back under the control of Rome, ending the schism between eastern and western Christianity—healing a centuries-old religious divide
These promises represented exactly the kind of support the struggling Fourth Crusade desperately needed. However, as later events would show, they were promises that could not realistically be fulfilled.
The supporters of the plan
The proposal received enthusiastic support from the crusade leadership across different national groups. The broad coalition of support demonstrated that the appeal of Prince Alexius's promises transcended national interests.
The Venetians:
- Led by Enrico Dandolo, the Doge of Venice
- Had a vested interest in the financial aspects of the deal
The French contingent:
- Supported by the counts of Blois and Saint Pol
- Represented a significant portion of the crusading army
Supporters of Philip of Swabia:
- Included Boniface of Montferrat, the overall commander of the crusade
- Also included the Bishop of Halberstadt
Why the leadership supported the plan
The crusade leaders had several compelling reasons to support Prince Alexius's proposal:
Military Advantages
With an additional 10,000 troops, the crusaders would be far more likely to succeed in recapturing Jerusalem. This represented a massive boost to their military strength—potentially more than tripling their forces. The promise of 500 knights for long-term defense of Outremer also addressed concerns about maintaining crusader territories after the main army departed.
Historical precedent:
- Crusaders had used Constantinople as their base for attacks on Syria and Palestine since the First Crusade
- This strategy had proven successful in the past
- Using Constantinople as a staging ground was therefore a familiar and tested approach
Financial Relief: The Critical Factor
The plan would solve the critical problem of the Venetian contract, which had only six months remaining. The financial pressures on the crusade were severe:
- Once the contract expired, the crusade would lose its fleet and most of its supplies
- Prince Alexius's money would allow them to pay off the contract in full
- The crusaders would be assured of supplies once their task in Constantinople was complete
- They could then continue their journey to Outremer with adequate resources
Without this financial solution, the Fourth Crusade faced the very real possibility of collapse before ever reaching the Holy Land.
The conspiracy theory debate
Some 19th-century historians have interpreted the crusade leadership's enthusiasm for the plan more suspiciously. They proposed that the Fourth Crusade was actually an elaborate conspiracy orchestrated from the very beginning by Philip of Swabia to help the young prince. This historiographical debate reveals how historians' interpretations of the crusade have evolved over time.
The Conspiracy Theory (Eduard Winkelmann, 1873-78)
Winkelmann argued that Philip of Swabia had planned to use the crusade to help the Angelus dynasty from as early as July 1201. According to this theory:
- Boniface of Montferrat was the perfect intermediary because of his connections
- He was related to both the king of France and the Angelus family (his brother Conrad of Tyre had married a daughter of Isaac II)
- His election as crusade leader in September 1201 gave Philip the tool he needed
- Boniface allegedly agreed with Philip to use the crusading army to restore Alexius to Constantinople
This interpretation suggests a high degree of planning and coordination from the very beginning of the crusade.
The Counter-Argument (Donald Queller and Thomas Madden, 1997)
Modern historians Queller and Madden have challenged this conspiracy theory with several strong arguments:
- Philip of Swabia was politically powerless and had no means to control the crusade's direction
- Neither Philip nor Boniface could have foreseen the series of circumstances that ultimately led the crusade to Constantinople
- A crusading army was not like a modern army with a fixed chain of command
- Boniface could not simply direct the army according to his will
- It would have been arrogant and foolish for Boniface to believe in Christmas 1201 that he had the power to manage the crusade's course
- The theory assumes too much planning and control that was simply not possible given the nature of medieval crusading armies
This interpretation emphasizes the role of circumstance and opportunity rather than elaborate planning.
This historiographical debate highlights the difficulty of determining whether the diversion to Constantinople was planned or the result of circumstances. The truth likely lies somewhere between these two extremes.
How the proposal weakened the Fourth Crusade
Despite the strong support from the leadership, Prince Alexius's proposal was not universally popular among the crusading army. The rank-and-file crusaders had different priorities and concerns that would significantly impact the crusade's strength.
Troop losses
Many ordinary crusaders were unwilling to endure further delays on their journey to Outremer. They had already experienced significant frustrations:
- The initial delay at Venice
- The controversial diversion to Zara
- Months of waiting through winter
Devastating Impact on Troop Numbers
As a result of the decision to accept Prince Alexius's plan, the crusade suffered catastrophic losses:
Permitted departures:
- Around 1,000 crusaders were allowed by the leadership to leave and travel directly to the Holy Land
Unauthorized departures:
- Another 1,000 crusaders left without permission, demonstrating their frustration with the crusade's direction
Total impact:
- Combined with losses at Zara, the crusading force was reduced to approximately 3,000 troops by August 1203
- This represented a dramatic reduction in military strength—potentially losing more than half of the remaining forces
- The irony was stark: while seeking 10,000 additional troops, the crusade lost 2,000 of its existing forces
Leadership departures
While most of the crusade leadership remained committed to the plan, there were some notable departures that weakened the command structure:
Renauld of Montmirail:
- The most significant leader to leave
- Took several important French knights with him
- Traveled directly to Outremer
Simon of Montfort and Guy of Vaux-de-Cernay:
- Had already distanced themselves from the attack on Zara
- Now decided to abandon the Fourth Crusade completely
- Made preparations to travel from the port of Apulia to Outremer
Despite these losses, the remaining leadership believed that if Prince Alexius could fulfill his promises, losing these figures would be a price worth paying. This calculation would prove tragically optimistic.
Pope Innocent III's opposition
The pope's response to the plan represented another significant weakening of the crusade's legitimacy and unity. His opposition removed the spiritual authority that had originally sanctioned the crusade.
Background of Papal Influence
Pope Innocent III's influence over the Fourth Crusade had already begun to decline after the diversion to Zara. The attack on a Christian city had damaged his authority over the crusading army, creating a precedent for the crusaders to act independently of papal wishes.
The pope's decision:
- By summer 1203, Innocent III decided to oppose Prince Alexius's proposal
- Although he may have been tempted by the offer of Byzantine submission to Rome, his opposition to Philip of Swabia remained firm
- His principled stance against Philip's involvement outweighed the potential benefits
Consequences of Papal Opposition
The pope's opposition had lasting effects:
- The pope was now permanently sidelined from decision-making
- He had little chance of forcing the crusaders to abandon the Constantinople plan and continue to Outremer
- The crusade was proceeding without papal approval or support
- This represented a significant loss of legitimacy for a venture that had begun as a papal initiative
The attack on Constantinople: timeline of events
The crusade's approach to Constantinople unfolded through a series of critical moments that would determine the fate of both the city and the crusade itself.
23 April 1203:
- Prince Alexius joined the fleet commanded by Enrico Dandolo and Boniface of Montferrat
- The combined force traveled towards Constantinople via Corfu
May 1203:
- At Corfu, Peter of Amiens and approximately half the crusader army decided to leave
- They only rejoined the crusade after receiving a secret promise that they would stay at Constantinople for a maximum of one month
- This shows the continuing reluctance of many crusaders to pursue this diversion
The secret one-month promise reveals the deep divisions within the crusading army. Even those who agreed to participate did so with strict conditions, showing how fragile the coalition had become.
23 June 1203:
- The crusader fleet arrived at Saint Stephen's, only seven miles from Constantinople
- The moment of confrontation was now imminent
3 July 1203:
- Dandolo and Boniface displayed Prince Alexius before the walls of Constantinople in a boat
- They expected supporters within the city to join them
- Instead, they were insulted and attacked
- This revealed that Prince Alexius did not have the support within Constantinople that he had claimed
The hostile reception of Prince Alexius on July 3rd should have been a warning sign. His claims of widespread support within Constantinople proved to be either exaggerated or completely false. This would have serious implications for the sustainability of any regime the crusaders managed to install.
4 July 1203:
- The attack on Constantinople began in earnest
- The crusaders captured the Galata Tower
- They broke the chain across the Golden Horn, allowing their fleet to enter the harbor
- This was a crucial tactical victory that gave them access to the city's vulnerable northern defenses
17 July 1203:
- The crusaders launched their second assault on Constantinople
- Faced with defeat, Alexius III fled the capital
- The city fell to the crusaders
Short-term achievements of the attack
Initially, Prince Alexius's plan appeared to be working successfully. The crusaders had achieved their immediate military objectives and seemed positioned to receive the promised rewards.
Isaac II's restoration
On 18 July 1203, the day after Alexius III fled, the restoration began:
- Isaac II was restored to the imperial throne by the Greek nobility
- Despite his blindness, he was reinstated as emperor
- The crusade leaders and Prince Alexius were invited into the city
- They entered into discussions with Isaac II about fulfilling the promises
Isaac II's agreement
Isaac II found himself in a difficult position upon his restoration. The reality of Byzantine resources clashed with his son's extravagant promises:
- He had considerable reservations about the promises his son had made
- He knew the commitments could not be fully fulfilled
- The Byzantine treasury and military simply did not have the resources Prince Alexius had promised
However, political reality forced his hand:
- The crusaders, wary that their new ally might turn against them, applied pressure
- Isaac II was forced to agree to the commitments Prince Alexius had made
- He had little choice but to accept the situation
The coronation of Alexius IV
The crusaders wanted additional security for their agreement, leading to a power-sharing arrangement:
- They insisted that Prince Alexius be crowned as co-emperor alongside his father
- On 1 August 1203, Prince Alexius became Alexius IV
- This meant the westerners' closest Byzantine ally was now in a position of power to fulfill his promises
- The co-emperorship theoretically gave the crusaders a guarantee of payment
Initial payments
Alexius IV made partial payment on his promises, though the amounts fell short:
- He gave the crusaders 100,000 marks (half of the promised 200,000)
- 50,000 marks went directly to the Venetians
- The other 50,000 marks went to the rest of the forces who had signed the Treaty of Venice
Financial settlements:
- The crusaders had to pay 36,000 marks to the Venetians to settle the Treaty of Venice completely
- They were left with the remaining money to provision and maintain their forces
- The crusader army, now numbering around 3,000 troops, was encamped in Galata
- They waited for their leaders to arrange the next stage of the journey to the Holy Land
An uncertain future
Although the initial objectives had been achieved, significant problems remained that would soon undermine everything:
Unfulfilled Promises
Despite the initial success, critical elements of the agreement remained unmet:
- Only half the promised money had been paid
- The promised 10,000 troops had not materialized
- The 500 knights for Outremer's defense had not been provided
- The submission of the Byzantine Church to Rome had not occurred
- The crusaders were now dependent on a weak emperor who lacked the resources to fulfill his son's promises
- The Byzantine population resented the western presence in their city
The short-term success masked underlying tensions that would soon erupt into disaster.
Key Points to Remember:
-
Prince Alexius Angelus was the son of the deposed Byzantine Emperor Isaac II, who had been overthrown and blinded by his brother Alexius III in 1195
-
Prince Alexius escaped in 1201 and made an extraordinary offer to the crusaders in December 1202: 200,000 marks, 10,000 troops, 500 knights for Outremer, and Byzantine submission to Rome
-
The crusade leadership across all nationalities (Venetians, French, and German supporters) enthusiastically supported the plan because it offered financial relief, military reinforcement, and followed historical precedent
-
The plan significantly weakened the crusade: approximately 2,000 troops left, some important leaders departed, and Pope Innocent III was permanently sidelined
-
The crusaders successfully attacked Constantinople in July 1203, leading to the restoration of Isaac II and the coronation of Prince Alexius as Alexius IV, but only half the promised payment was delivered and the other promises remained unfulfilled