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| 6028587626 | feudalism | Medieval European political, economic and social system from the 9th to 15th century. An example of feudalism is someone farming a piece of land for a lord and agreeing to serve under the lord in war in exchange for getting to live on the land and receiving protection |  | 0 |
| 6028587627 | king | the male ruler of an independent state, especially one who inherits the position by right of birth. |  | 1 |
| 6028587628 | peasant | a member of a class of persons who are small farmers or farm laborers of low social rank |  | 2 |
| 6028587629 | plague | A deadly disease that spreads rapidly from person to person. |  | 3 |
| 6028587631 | queen | the female ruler of an independent state, especially one who inherits the position by right of birth. |  | 4 |
| 6028587632 | monarch | a sovereign head of state, especially a king, queen, or emperor. |  | 5 |
| 6028587633 | knight | A man who received honor and land in exchange for serving a lord as a soldier. |  | 6 |
| 6028587634 | social hierarchy | organization of people in a society into levels based on power |  | 7 |
| 6028587635 | church | Christian place of worship |  | 8 |
| 6028587636 | pope | Leader of the Catholic Church |  | 9 |
| 6028587637 | priest | an ordained minister of the Catholic, Orthodox, or Anglican Church having the authority to perform certain rites and administer certain sacraments |  | 10 |
| 6028587638 | monk | A man who devotes his life to a religious group, often giving up all he owns. |  | 11 |
| 6028587639 | revolt | to fight in a violent way against the rule of a leader or government |  | 12 |
| 6028587640 | black plague | A disease that engulfed Europe during the Middle Ages. It killed about one-third of the population and was carried by fleas. Because of this, the feudal system died out. |  | 13 |
| 6028587641 | black death | Plague; Pestilence. Killed one third to one half of Europe's population. Brought an end to the feudal system. |  | 14 |
| 6028587642 | Islam | A religion based on the teachings of the prophet Mohammed which stresses belief in one god (Allah), and a body of law written in the Quran. |  | 15 |
| 6028587643 | empire | A group of states or territories controlled by one ruler | 16 | |
| 6028587644 | caliphate | Islamic empire ruled by those believed to be the successors to the Prophet Muhammad. |  | 17 |
| 6028587645 | expansion | Extending the nation beyond its existing borders | 18 | |
| 6028587646 | crusades | A long series of wars between Christians and Muslims. |  | 19 |
