They were unfree agricultural workers, bound to a hereditary plot of land and subject to a local lord's will.
What are Serfs?
A disease primarily carried by fleas on black rats and other rodents.
What is the Black Death?
A system in which the ruler granted land to his nobles in exchange for their loyalty.
What is Feudalism?
This is a siege weapon that launches heavy stones, fireballs, or other debris over castle walls.

What is the Trebuchet?
He was the first European explorer to reach North America.
Who is Bjarni Herjolfsson?
They were skilled manual workers who produced essential goods, tools, clothing, weapons, and building materials for everyday life, manors, and growing towns
Who are Craftsmen?
This took place on October 25, 1415, during the Hundred Years' War, and involved about 8,000 English troops versus 15,000 French troops. The English troops won because they had the longbow.
What was The Battle of Agincourt?
They were usually noblemen, heavily armored and often mounted on horses.
What is a Knight?
This heavy blunt-force weapon is designed to crush bones, dent, or shatter plate armor without a sharp edge.

What is a Mace?
He was a King involved in the Investiture Controversy.
Who is Henry IV?
They were businesspeople, traders, and peddlers who bought, sold, and transported goods.
Who are Merchants?
This was a deadly outbreak that spread across the empire and killed at least 15 million people.
What is the Plague of Justinian (Bubonic Plague)?
A knightly code of conduct, both in and out of battle, focused on loyalty, duty, and honor.
What is Chivalry?
This was a powerful, roughly 6-foot-tall selfbow made from yew wood that served as the backbone of English military power during the Hundred Years' War.
What is an English Longbow?
He was the first European explorer to reach North America.
Who is Justinian I?
They were young people bound by a legal contract to live and work under a master craftsman to learn a specialized trade
What is an apprentice?
A long series of conflicts between England and France over the French throne.
What was the Hundred Years' War?
This was a defensive architectural feature in medieval castles and fortifications. It was an opening or vertical shaft in the ceiling of a castle’s gatehouse, entryway, or passageway
What is a Murder Hole?
This is a two-handed, straight, double-edged European sword that rose to prominence during the late Middle Ages 
What is a longsword?
These people are best known for their vicious attacks on European coastal settlements.
Who are the Vikings?
They were fully qualified artisan, craftsmen, or scholars who had reached the highest rank in their occupation or academic field
What is a Master?
Pope Leo III crowned a new Emperor of the Romans on December 25, 800, during Christmas Mass at Old St. Peter's Basilica in Rome.
What is the Coronation of Charlemagne?
These are places where monks live together, away from others.
What are Monasteries?
This was a dominant projectile weapon featuring a horizontal bow mounted on a wooden stock, fired via a mechanical trigger and nut mechanism.

What is the crossbow?
He divided the empire into two halves.
Who is Emperor Diocletian?
This was the main reason the Vikings went on raids early on.
What is wealth?
This was the main reason behind the Hundred Years' War.
What is a succession dispute?