The Ottoman Sultan Mehmed II led an army to Constantinople in the spring of 1453 to siege the city. After a month, the Ottomans were successful in sacking the city, and destroying the Eastern Romany (or Byzantine) Empire. The effect of this sack was massive, allowing the Ottoman armies free reign into Europe, giving the Ottomans control of the Bosphorus Strait and the Black Sea, sending Greek scholars into exile,  and generally worsening relations between Christian Europe and Islamic governments in the Middle East.

The Battle of Talas was fought between the Arab Abbasid Caliphate and the Chinese Tang Dynasty in 751 CE. Prior to the battle, Chinese forces had been spreading rapidly westward and facing little opposition; however, at the Battle of Talas, they were defeated by the Arab forces, and Chinese expansion was halted for several centuries. The battle is considered important for transferring control over the “Silk Road” from Chinese to Arab hands and for turning back the massive forces of the Tang Dynasty. Also, it is sometimes said that Arabs learned the art of paper making from the Chinese prisoners they captured in the battle, thus spreading paper-making technology to the Middle East and eventually Europe.

Mehmet II was a Sultan of the Ottoman Empire who in 1453 conquered the city of Constantinople, later renamed Istanbul. Mehmet II is remembered as a great hero in Turkish society and is often referred to as Mehmet the Great or Mehmet the Conqueror.

After the death of the prophet Muhammad, the forces of Islam expanded dramatically across North Africa and the Middle East. By 732 CE, they had crossed into mainland Europe and controlled much of modern-day Spain and southern France. At the Battle of Tours, they were defeated by the Frankish forces led by Charles Martel (often called Charles the Hammer). This is often considered a turning point in world history as the forces of Islam would never again penetrate so far into Europe. 

The First Crusade was initiated by Pope Urban II in 1095 with the original aim of assisting the Byzantine Empire in defending itself against the invading Turkish forces; however, the mission quickly expanded to include liberating the Holy City of Jerusalem from under Muslim control. Jerusalem was “liberated” in 1099, but this incident would mark several hundred years of competition between the Christian forces of Europe and the Islamic forces of the Near East that are collectively called “the Crusades.”

The First Crusades were initiated by Pope Urban II in 1095 with the primary goal of retaking the Holy Land and Jerusalem from the "infidels." 

The armies of the First Crusade was made up primarily of young French soldiers and nobles.

The Crusades is the name given to a series of conflicts between Christian Europe and the Islamic Empire of the Near Middle East between the eleventh and fourteenth Centuries. The primary goal of the Crusades was to retake the city of Jerusalem and the Holy Land of Palestine from the "infidels." It had varying degrees of success. 

The First Crusade was able to successfully take Jerusalem and a few other isolated areas of the Holy Land, but the people who remained there were alone in a large area surrounded by hostile Arab enemies. They required constant resupplying from the trading ships of the Italian city-states, who subsequently grew immensely wealthy from the trading relationship.

The Holy Land and Jerusalem, captured in the First Crusade, were conquered by the Islamic forces of Saladin in 1187 CE. This led directly to the Third Crusade, waged from 1189 to 1192 CE, which did not result in the European forces retaking Jerusalem; however, it did lead Saladin to open the city of Jerusalem to protected Christian pilgrimage.