The great schism (Western Schism) was a division between the Roman Catholic Church and the Eastern Orthodox churches. The Roman Catholic Church was led by pope Leo IX while the Eastern Orthodox church was led by Constantinople. The reason of the separation was because the Roman Catholic Church from the west and the Eastern Orthodox Church from the east had different beliefs on Christianity, different languages- so it was difficult to communicate to each other. On the West side countries stand: turkey, Europe, Greece, Italy whereas, the east countries have the Middle East, Egypt and Iraq.
Some speculate before the Battle of the Milvian Bridge, Constantinople had a dream about Jesus telling him to convert to the East side or he won’t win the battle. Constantinople did listen to convert and won the battle. Constantinople then decides to split the Christian Church in half as he wants to see how many people will convert to the East.
The Great Schism was a tear in the Roman catholic church lasting from the 9th century to the 15th century. In the 14th century, it was a battle between 3 men claiming to be the pope, each man having a different religious belief and different followers. This began after the main pope, Gregory(I think that's his name) died and an election for a new pope arose. After 3 men were trying to become the true pope, it led to an outrage between the cardinals and the people(no not the football team cardinals.) After this was over in the 15th century, they finally elected Innocent VII as the official pope and ending any more chaos.
Since northern Ireland is part of the UK but is stated separately is because Scotland,wales and Cornwall are all considered to be a unit under the British (England) while northern Ireland is just a jurisdiction where England holds power not a unit under England
