First pick a narrowly defined topic, such as:
What houses did serfs live in?
What did medieval people eat?
What technologies were developed in the Middle Ages?
When was the chimney invented, and how did people cook without one?
Then do research. Ask questions in Wikianswers. Do not believe the first answer you get, unless it has good links. Follow the links. Wikipedia has a lot of articles, and the following would work for the above (found by following the "see also" links in Wikipedia articles):
Wattle and Daub
Medieval Cuisine
Medieval Technology
Communal Oven
Chimney
Then write. To write, first summarize what you tried to find out, then say what you found out, then draw a conclusion.
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The Middle Ages followed the fall of the Roman Empire.
The things that were stolen in the middle ages were mainly food that was stolen by the poor and there were organised gangs that would steel from the rich.
There was no explorers in the middle ages. When exploration started that is when the middle ages ended.
Zweihander could be one.
Thou art...i think