The Great Schism_ When the Christian Church Split in 1054

The Great Schism. One of the most important and complex stories in Christian history. In this video we're exploring how the ancient Christian church split into two distinct branches, the Greek Orthodox Church and the Roman Catholic Church. Before we begin we want to mention that everything in this video is based on our in-depth research from trusted sources. We've made every effort to ensure that our facts from dates and names to key events are as accurate as possible. However if you notice any mistakes or have additional insights please let us know in the comments so we can update our findings. Throughout the high middle ages Christian civilization was deeply divided. On one side there was the Latin West where the Pope in Rome was seen as the supreme spiritual leader. On the other the Greek Orthodox Church was led by the Patriarch of Constantinople. Back around 285 AD when the Roman Empire stretched from northern England to the upper Nile, Emperor Diocletian realized the empire was too big to rule as one. He split the empire into two parts for easier management. The west became predominantly Latin speaking while the east was dominated by Greek. As Christianity spread these cultural and administrative differences grew even bigger. Later in 381 AD church leaders under the guidance of Emperor Theodosius I gathered at the first council of Constantinople. This wasn't just another church meeting, it was held to settle arguments that were still going on since the council of Nicaea especially about the Holy Spirit and to bring the church together during a time of confusion and division. Originally called Byzantium the city was a Greek settlement before being renamed Constantinople by Emperor Constantine in 330 AD. Constantinople derives its name from Emperor Constantine and the Greek word poly meaning city. In other words it literally means city of Constantine. Over time Constantinople evolved into a major Christian center that connected both the eastern and western parts of the empire. At the first council of Constantinople in 381 AD church leaders updated the Nicene Creed originally written in 325 AD at the council of Nicaea. The creed begins with the Greek word pistevomen meaning we believe and was designed to unite all Christians under a shared faith. At this council the leaders clarified that the Holy Spirit comes from the Father and is equal to both the Father and the Son, an idea supported by verses such as John 15 26. This doctrinal clarification later contributed to major debates most notably the Filioque controversy. By the 6th century many in the western church speaking Latin felt the original creed did not fully explain the Trinity. To address this they added Filioque meaning and the Son so that the creed would state that the Holy Spirit proceeds from both the Father and the Son. This change was meant to support the idea that Jesus was completely divine. Many western Christians liked the addition because it made their belief in Jesus' full divinity clearer. However the Greek Orthodox Church did not agree. They argued that any change to the creed considered the true word of God needed the agreement of all churches. They also believed that adding the word made the Father seem less important. A seemingly small change led to two major issues. Authority, the Roman Catholic Church says that only the Pope can decide what the church's official teachings and beliefs are, what we mean by doctrine. Trinity understanding. Eastern Christians assert that the Holy Spirit comes solely from the Father preserving distinct roles within the Trinity. In contrast western teachings heavily influenced by Augustine support the idea that the Spirit also comes from the Son. After the fall of the Western Roman Empire in 476 AD divisions within the church began to appear. In 482 AD Emperor Zeno and Patriarch Acacius of Constantinople introduced the Henotikon. Henotikon is a Greek word derived from Henesis which means union or unity. It is often translated as letter of union. Its purpose was to reconcile two groups within the church, Chalcedonians and Miaphysites. Chalcedonians were those who believed that Jesus had two distinct natures both human and divine. Miaphysites maintained that Jesus had one united nature. To ease this conflict the Henotikon was deliberately written in vague terms. It intentionally avoided strong language that might favour one side over the other. Instead it aimed to find some common ground for both groups without forcing a full agreement on every detail of Jesus's nature. Although the Henotikon was meant to calm tensions its unclear language upset the Pope. In 484 AD Pope Felix III excommunicated Acacius which sparked the Acacian Schism. This division lasted 35 years until unity was restored in 519 AD. Later in 867 AD when Patriarch Photius was appointed without the Pope's consent further conflict arose. Combined with the ongoing Filioque dispute this ultimately led to mutual excommunications and created lasting distrust. Political conflicts further deepened the church's divisions. In Byzantium internal tensions were worsened by events such as Emperor Leo VI's controversial marriages that went against church rules. Meanwhile in the West Pope Leo III crowned Charlemagne in 800 AD and the donation of Pepin helped establish the Papal States. These actions transformed the Pope into both a spiritual leader and a secular ruler. Such moves widened the gap between Western and Byzantine traditions and reshaped the political role of the church. These power struggles set the stage for further misunderstandings and conflicts eventually contributing to the growing chasm between the Eastern and Western churches. In 1053 papal envoys led by Cardinal Humbert travelled to Constantinople. At Agia Sophia, a grand symbol of Greek Orthodox heritage, they placed a letter of excommunication on the altar. This bold act marked the complete split between the two churches. In response Patriarch Michael Serularius excommunicated Humbert and his group. Historians view this mutual exchange as the final permanent division between the Greek Orthodox Church and the In 1204 the Crusaders attacked Constantinople. At first their goal was to reclaim Jerusalem but things changed. They owed money to Venetian merchants and the Byzantine Empire was struggling with political conflicts. This led the Crusaders to turn toward Constantinople instead. When they entered the city they looted churches, palaces and homes. Many priceless Byzantine treasures were stolen or destroyed. Among them were the famous bronze horses which were taken to Saint Mark's Basilica in Venice where they still stand today. The attack was brutal, leaving the city in ruins. It deepened the divide between the Western and Eastern Christian worlds, leading to lasting mistrust. Then in 1453, when the Ottomans conquered Constantinople, the power of the Ecumenical Patriarch was greatly reduced. At the same time Moscow rose as the third Rome, emerging as the new centre of Eastern Orthodoxy and further reinforcing Eastern traditions. Later events such as the Protestant Reformation widened the divide even further. Today many historians view the events of 1204 as the true point of no return in the split between Eastern and Western Christianity. Despite these age-old divisions, many church leaders today are taking steps to heal old wounds. Leaders from both traditions now meet globally for dialogue, joint services and academic exchanges. These efforts are supported by organisations such as the World Council of Churches. A bright sign of hope occurred in 2025 when both churches celebrated Easter on the same day, April 20th, showing that unity is still within reach. It all began with one small change, adding the word Filioque to the Nicene Creed. This change eventually led to a long conflict about who should have power in the Church, what Christians should believe and how the Church should be run. Early splits and later political fights worsened the division, leading to major events such as the mutual excommunications in 1054 and the looting of Constantinople in 1204. Even with these long-standing divisions, new efforts remind us that at the heart of Pistevo, which means I believe. Thank you for watching. If you enjoyed this video, please like, subscribe and click the bell icon for updates.