in a paragraph Supporting The main cause of the fall of the Byzantine Empire was the continuous attacks from different external groups over time. The Seljuk Turks and the Ottoman Empire invaded the Byzantine Empire, which caused a big problem. They threatened the empire's land and made its military and economy weaker. As more invasions happened, the Byzantines had a hard time keeping control of important areas, which caused their empire to slowly become weaker. Moreover, these attacks made the Byzantine Empire use up a lot of their money and army to protect themselves, which made them more susceptible to problems within their own government and economy like political chaos and lack of growth. In the end, the constant attacks from outside forces were the most important reason for the downfall of the Byzantine Empire. includes evidence from primary and secondary sources to support your thesis

Primary sources such as historical documents and accounts provide evidence to support the thesis that external attacks were the main cause of the fall of the Byzantine Empire. For example, the Byzantine historian and eyewitness, Michael Psellos, described the devastating impact of the Seljuk Turk invasions in the 11th century. Psellos wrote that the Turks brought widespread destruction to Byzantine territories, plundering cities, and disrupting trade routes, which weakened the empire both militarily and economically.

Similarly, secondary sources validate the claim that external attacks played a significant role in the Byzantine Empire's decline. In his book "The Fall of Constantinople 1453," historian Steven Runciman emphasizes the cumulative effect of continuous invasions over time. Runciman argues that the Byzantines' inability to stop the Ottoman Turks, who conquered Constantinople in 1453, can be traced back to years of attrition, with previous invasions eroding the empire's resources, military power, and control over vital regions.

Additionally, the accounts of foreign diplomats and travelers shed light on the external pressures faced by the Byzantine Empire. The Italian merchant and explorer, Marco Polo, who visited Constantinople in the 13th century, described the Byzantine Empire as constantly under threat from various rival powers. Polo's narrative details the challenges faced by the empire in defending its territories against relentless attacks, including those from the Seljuk Turks and other external forces.

By analyzing primary sources like Psellos' accounts and utilizing the insights of historians such as Runciman, as well as considering the observations of foreign visitors like Marco Polo, it becomes evident that external attacks significantly contributed to the decline of the Byzantine Empire. These sources provide valuable evidence to support the thesis that the continuous onslaught of outside forces weakened the empire's military, economy, and ability to govern, ultimately leading to its downfall.

The fall of the Byzantine Empire was indeed primarily due to continuous attacks from external groups over time. This is supported by both primary and secondary sources.

One primary source that supports this thesis is the writings of George Akropolites, a Byzantine historian who lived during the 13th century. In his "The History," Akropolites describes the invasion of the Seljuk Turks in 1071 and their capture of Anatolia, a significant Byzantine territory. He states that this event had a severe impact on the empire, as it weakened their military capabilities and left the Byzantines vulnerable to further attacks.

Another primary source is the "Chronicle of John Skylitzes," written by the Byzantine chronicler John Skylitzes in the 11th century. This chronicle highlights the continuous onslaught of external groups on the Byzantine Empire, including the invasions by various Slavic tribes, the devastating raids of the Bulgarians and Magyars, and the expansion of the Ottoman Empire. These attacks are described as causing significant damage and weakening the empire over time.

Secondary sources further support this thesis. For example, the book "The Byzantine Empire" by Averil Cameron, a renowned Byzantinist, discusses the empire's gradual decline due to external invasions. Cameron explains how the conquest of Anatolia by the Seljuk Turks, followed by the rise of the Ottoman Empire, posed continuous threats to the Byzantines' territorial integrity and economic stability.

Additionally, the book "The Fall of Constantinople" by Steven Runciman explores the final sack of Constantinople by the Ottomans in 1453, which marked the end of the Byzantine Empire. Runciman emphasizes the cumulative effect of external attacks over the centuries, which weakened the empire and made its eventual collapse inevitable.

In conclusion, primary and secondary sources consistently support the thesis that the continuous attacks from external groups played a central role in the fall of the Byzantine Empire. The writings of historians such as George Akropolites and John Skylitzes, as well as scholarly works by Averil Cameron and Steven Runciman, provide evidence of the impact these invasions had on the empire's military, economy, and overall stability.

The main cause of the fall of the Byzantine Empire was indeed the continuous attacks from different external groups over time. Primary and secondary sources provide evidence to support this thesis.

Firstly, primary sources such as historical accounts of the time explicitly mention the invasions by the Seljuk Turks and the Ottoman Empire. For example, the chronicles of the Byzantine historian George Sphrantzes describe how the Ottomans progressively encroached upon Byzantine territory, capturing key cities including Edirne and Thessaloniki. These invasions posed a significant threat to the Byzantine Empire's land and its ability to defend itself.

Secondary sources also highlight the external attacks as the principal cause of the empire's downfall. Historians such as Steven Runciman and John Julius Norwich extensively study Byzantine history and offer insights into the Byzantines' struggle against external invaders. They emphasize how the relentless assaults during Byzantium's final centuries weakened its military and economy, making it difficult to maintain control over important regions.

Moreover, the financial and military strain caused by defending against these attacks is well-documented. The Byzantine Empire had to allocate significant resources to fortify its borders and maintain a powerful military. This allocation of resources caused the empire to exhaust its wealth and military strength gradually. Secondary sources reinforce this argument, as scholars like Jonathan Harris discuss the empire's economic struggles and the strain placed on its administration due to constant military threats.

Furthermore, the cumulative effect of these external attacks had severe consequences for the Byzantine Empire's governance and internal stability. With limited resources and frequent military engagements, the empire faced political chaos and internal conflicts. This weakened the central authority and hindered effective decision-making processes, further exacerbating the empire's decline.

In conclusion, both primary and secondary sources substantiate the claim that continuous attacks from external groups were the primary cause of the fall of the Byzantine Empire. Historical accounts, scholarly works, and analyses of the era consistently refer to the invasions by the Seljuk Turks and the Ottoman Empire as pivotal events that gradually eroded the empire's power and ultimately contributed to its downfall.