Title: Crusades | Definition, History, Map, Significance, & Legacy | Britannica
Headings: 
Crusades
Christianity
How many Crusades were there, and when did they take place?
What was the purpose of the Crusades?
Who were the leaders of the Crusades?
Were the Crusades successful?
Were there lasting results from the Crusades?

Content: The Crusader states extended trade with the Muslim world, bringing new tastes and foods to Europe. The Crusades had a marked impact on the development of Western historical literature, bringing a plethora of chronicles and eyewitness accounts. However, Constantinople never returned to its former glory after being sacked by the Fourth Crusade, and the schism between Eastern and Roman Catholic Christianity was further entrenched. The Islamic world saw the Crusaders as cruel invaders, which helped engender distrust and resentment toward the Christian world. Read more below: The results of the Crusades
Approximately two-thirds of the ancient Christian world had been conquered by Muslims by the end of the 11th century, including the important regions of Palestine, Syria, Egypt, and Anatolia. The Crusades, attempting to check this advance, initially enjoyed success, founding a Christian state in Palestine and Syria, but the continued growth of Islamic states ultimately reversed those gains. By the 14th century the Ottoman Turks had established themselves in the Balkans and would penetrate deeper into Europe despite repeated efforts to repulse them. The Crusades constitute a controversial chapter in the history of Christianity, and their excesses have been the subject of centuries of historiography. The Crusades also played an integral role in the expansion of medieval Europe.