Romanesque and Gothic are the medieval styles of architecture most dealt with in history books, though there were others.
Feudalism, crusades, plague, monarchy, chivalry, religious conflict, serfdom, guilds, Gothic architecture, cultural decline, and the emergence of nation-states can be used to characterize the events of the Middle Ages.
Castles in the Middle Ages were used to keep out enemies.
See the question: What are some weapons used in the middle ages?
In the Middle Ages
because they used wood smoke as a deorderant in the middle ages
people in the middle ages used letters or talking to face to face
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.
It was used in the middle ages by monks!
the middle ages