Feudal society is a military hierarchy in which a ruler or lord offers mounted fighters a fief (medieval beneficium), a unit of land to control in exchange for a military service. The individual who accepted this land became a vassal, and the man who granted the land become known as his liege or his lord.
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Copernicus' observations of the heavens were made with the naked eye. He died more than fifty years before Galileo became the first person to study the skies with a telescope. From his observations, Copernicus concluded that every planet, including Earth, revolved around the Sun.
