To inform you about serfs, they were considered the base or main structure of the economic system, due to the fact that they supplied labor, goods, and any other necessities to the entire kingdom.
They were basically slaves, considering that they worked on the lands for their landlords, paid taxes and were responsible for nearly EVERYTHING that was involved with the lords property.
Fun Fact: The most common serf was a villain.
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Answer:
Women in the Byzantine Empire (4th to 15th century CE) were, amongst the upper classes, largely expected to supervise the family home and raise children while those who had to work for a living did so in most of the industries of the period, from manufacturing to hospitality.
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Explanation:
It made transportation and trade easier.
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The answer to your question would be, John Stuart Mill