To believe, or not to believe

It is difficult to agree or disagree with that feudalism was existed in the Middle Ages. In fact, I think that most historical events were not 100% true. So I chose to believe whatever made sense to me. So, was feudalism really existed in the Middle Ages? I think so. Feudalism was basically a feudal system which the landlord (usually a king) gave his/her land to his/her vassals in return for military services/aids. Even thought the term, feudalism, was first used in 17th century, its ideology was first appeared in the Middle Ages. Most places in Europe in the Middle Ages had the feudal system. England was the last place in Europe to develop the feudalism system in 1066 by William the Conqueror. In other places in Europe, they already developed their feudalism before 1066. The first two places were France and Germany by the Norman in 9th and 10th century. Other places in Europe had the feudalism system later on. The places were Spain, Italy, Scandinavia, England and the Slavic countries.