What is another term for a document created at the time of or by a person who was present at a historical event?

answer; i believe the above statement is (true);

although the crusades failed to capture jerusalem, they had several major impacts on western europe. they increased the authority of the king: sometimes nobles died in battle without leaving an heir in which case the king got their land. kings passed taxes to pay for the crusades.

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.