In the history of medieval Europe, a war that lasted nearly two centuries shocked the entire world, known as the Crusades. This war originated in the 11th century Europe, with its birthplace being Jerusalem, located in the present-day areas of Israel and the West Bank of the Jordan River.

Jerusalem, a city regarded as a holy site by Christianity, Judaism, and Islam, has been a focal point of various religious conflicts since ancient times. In 1071 AD, the Seljuk Turkic Empire occupied Jerusalem, which caused strong dissatisfaction in the Western Christian world. The Pope called upon the Christian countries of Europe to organize an army and carry out a military expedition to the East to reclaim Jerusalem. This was the origin of the Crusades.

The First Crusade began in 1096 and lasted nearly 20 years, ultimately succeeding in reclaiming Jerusalem in 1099. After that, the Christian countries of Europe embarked on several more crusades, attempting to consolidate their dominance in the East. However, these crusades did not achieve lasting success and instead triggered a series of religious conflicts and wars.

The Crusades not only altered the political landscape of Europe and the Middle East but also had a profound impact on world history. They pushed Europeans to gain a better understanding of the East, promoting cultural exchange and trade development. At the same time, they exacerbated religious conflicts, leading to countless wars and atrocities.

Overall, the Crusades, originating in Jerusalem, were wars triggered by religious conflicts that changed the historical course of the world, leaving a deep historical imprint.

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