The Crusades

The Byzantine Empire was in trouble. The Seljuk Turks had taken much of its territory in what is now Turkey. The emperor in Constantinople appealed to Pope Urban II for military help.

Urban saw his opportunity. At a church council in Clermont, France, he called on the knights of Europe to march to Jerusalem and fight for the Christian faith.

“The crowds reportedly cried out before Urban had finished speaking. The idea had already taken hold.”

The appeal worked for different reasons. Knights wanted glory and the forgiveness of their sins. The Pope wanted to expand his authority. Everyone wanted Jerusalem, the holiest city in Christianity.

This was something new. For the first time, warfare and religious devotion were officially fused into a single mission. Fighting became an act of worship.

This still matters today. The conflicts that began in 1095 left deep wounds between Christian and Muslim communities that shaped politics and tensions for centuries — and have not entirely healed.

The First Crusade actually started in two waves. The first was a poorly organised flood of ordinary people, led by preachers like Peter the Hermit. They left too early, with few supplies, and most died before reaching Jerusalem.

The second wave was better organised. Noble armies from France, Normandy, and southern Italy gathered in late 1096 and began the long march east through Byzantium and into Syria.

“The journey was its own ordeal — and it had barely begun.”

Along the way, some crusaders turned on Jewish communities in cities like Worms, Mainz, and Cologne. Thousands of Jews were killed in what became known as the Rhineland massacres.

The march east was brutal. Heat, hunger, disease, and hostile territory killed enormous numbers. But enough survived to continue, and to reach the walls of Jerusalem.

These events set a pattern that would repeat throughout the crusading era: extraordinary religious energy combined with extreme violence, often directed at the wrong people.

After three years of brutal marching and fighting, the crusaders finally reached Jerusalem in June 1099. They had lost enormous numbers to battle, disease, and starvation.

The siege lasted about five weeks. When the walls were finally breached, the crusaders swept in and killed most of the city's population — Muslims and Jews alike.

“The fall of Jerusalem in 1099 was one of the bloodiest days of the medieval world.”

For the crusaders, this was a holy moment. They believed they were fulfilling God's will. Many wept as they prayed at the Church of the Holy Sepulchre.

For Muslim and Jewish communities, it was a catastrophe. The memory of the massacre lasted for centuries and became a central reference point in how the Islamic world understood the crusaders.

This event sits at the heart of how people understand the Crusades. It shows how sincere religious belief and extreme violence can exist together — and why this history is still deeply contested.