He first Crusade was in the period (1096-1099) and the Fourth Crusade
was in the period (1202-1204)
<span>(1202-1099)----------103 years <span>separated the First and the Fourth Crusades
</span></span>The crusades were a military campaigns with the specific objective of restoring christian control of the Holy Land<span> , were fought
over a period of almost 200 years.</span>
Three events that happened in Europe and Asia during the Middle Ages and had a big effect and contributed to changes were:
- The rise of Islam;
It changed the religion of the people in a very big area in very short space of time, changed the demographics of certain regions, and also contributed to bigger unification among the European countries in order to stop their progress and preserve Christianity.
- The plague (black death);
It influenced the demographics of the places were it came in a terrible way, millions of people died, and it was a huge blow for lot of countries on economic and military level.
- the Ottoman Empire;
It cut off the free trade between Europe and Asia with having portions of the Silk Road on its territory, and also making the eastern part of the Mediterranean very unsafe for sea travel and trade. That triggered the explorations of the Europeans, and the discovery of new trade routes, and new lands.