What is Troy (oz) and where does the term come from?

Oz term Troy
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What is Troy (oz) and where does the term come from?

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Troy comes from the French city of Troyes, the ancient capital of the Champagne region. The Troy weight is 480 grains. Each grain weighing 64.79891 mg. The troy ounce weighs 480*64.79891mg = 31.1034768 gr. There are 1.000/31/1034768 = 32.1507466 Troy ounces in 1 kilogram of Gold.