# data[].attributes.body
The Black Death originally originated in Central Asia and was carried over to Europe by Sailors. The Black Death was highly contagious and caused Black Boils that oozed blood.

# data[].attributes.body
Feudalism was a social system in which royalty would give lends from the crown to the military in exchange for service.

# data[].attributes.body
Castles were built for protection and defense against attackers of the royal families. They were often built on top of hills or around rivers for tactical advantage.

# data[].attributes.body
The Crusades were religious wars carried out by the Latin Church. They were fought for multiple reasons, but the most prominent being to free the holy sites in Holy Land from the Muslims, especially Jerusalem.

# data[].attributes.body
The Spread of Islam and the Rise of the Ottoman Empire spread quickly throughout Europe/The Middle East.