Don't worry "medieval" has nothing to do with the word "evil"! It comes from the Latin word aevum, age, and is just another word for the Middle Ages. Historians, especially in Europe, have tended to divide civilisation into three parts - classical or ancient, middle and modern. The Middle Ages in this sense go (very roughly) from about the 5th century to the end of the 14th; though the term is more often used to describe the period from about the 11th century.
If you have a look at this timeline it will give you an idea of some of the world events during this period.
If you have a look at this timeline it will give you an idea of some of the world events during this period.