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They were themselves internally differentiated into
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knights, esquires and mere gentlemen.
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Knights were created by the monarch for service,
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for service in war, usually,
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or in government--as indeed they still are.
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High-ranking civil servants in Britain and military officers
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very often get a knighthood at the end of their active careers,
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though the notion of service has broadened somewhat
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nowadays to include other roles in society.
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So we have Sir Ian McKellen,
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also known as Gandalf.
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We have Sir Paul McCartney, of course,