The medieval period, known as the Middle Ages, covers nearly 1,000 years of European history. According to some historians, the era began in A.D. 476 when a German chieftain overthrew the last emperor of the Western Roman Empire.
The lord of a large fief, such as a baron, might give individual manors to his knights, in exchange for their service. Those knights thus became lords of their own small manors. But they still owed allegiance to the baron.
the principal activity in one's life to earn money
Guild members all charged the same prices for the same quality work, and they limited the number of people permitted to follow a particular occupation.