I am not sure I understand your question. What do you mean by "what"? would you please restate?
Castles in the Middle Ages were used to keep out enemies.
See the question: What are some weapons used in the middle ages?
It means Queen/mistress and was used in the middle ages to describe the virgin Mary and is now used as a first name
In the Middle Ages
people in the middle ages used letters or talking to face to face
because they used wood smoke as a deorderant in the middle ages
YES
to entertain
knights
Yes, polyphony was used during the Middle Ages. We do not have any real idea of when polyphony was introduced, but the earliest texts describing it date to the Early Middle Ages. By the end of the Middle Ages, it was highly developed. There is a link below to an article on polyphony, beginning at the section on its origins.
the middle ages
It was used in the middle ages by monks!