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Benedict of Nursia founded a religious order of monks and nuns that is based on the Rules of St. Benedict. It is the first monastic order. https://en.wikipedia.org/wiki/Benedictines -
The popes acquired significant property and power over Rome. In 756, Pepin the Short, majordomo helped the pope defeat the threatening Lombards. He gave the conquered territory to the church. His donation provided the basis for the papal claim to temporal power, establishing the Papal States. https://www.britannica.com/summary/Papal-States -
The breakup of the Christian Church into two. The Western Roman Catholic and the Eastern Church were born. -
The battle between the Anglo-Saxon English and William the Conqueror, the Duke of Normandy. It ended with a decisive victory for the Normans and William was crowned King of England. https://en.wikipedia.org/wiki/Battle_of_Hastings -
The Byzantine Empire was defeated by the Seljuk Turks and the emperor Romanus IV Diogenes was captured. This battle marked the beginning of the Turkish domination. https://www.britannica.com/event/Battle-of-Manzikert -
Holy Roman Emperor, Henry IV went to the Castle Canossa to pledge forgiveness from Pope Gregory VII, who had banned Henry from the church earlier. http://scihi.org/henry-iv-canossa/ -
It's the compromise of Henry V and Pope Calixtus II, settling the Investiture Controversy, a conflict between the church and the state, about the right to appoint religious offices. https://en.wikipedia.org/wiki/Concordat_of_Worms -
A fight between the Crusades and Sultan Saladin. The Christian Crusader armies were defeated by the Muslim forces and Jerusalem was recaptured by the Sultan. https://www.britannica.com/event/Battle-of-Hattin -
It's a Roman Catholic preaching founded by Dominic Guzman, and approved by Pope Honorius III. The members were called Dominicans. Famous Dominican, Thomas Aquinas was the founder of theology. https://en.wikipedia.org/wiki/Dominican_Order -
The Crusaders lost control over Acre, the most important Christian-held port in the Levant to the Muslims. It settled the long-term presence of the European presence of Christian kingdoms in the Holy Land. https://www.worldhistory.org/article/1267/the-siege-of-acre-1291-ce/