Gros (coinage)

A gros was a type of silver coinage of France from the time of Saint Louis. There were gros tournois and gros parisis.[1] The gros was sub-divided in half gros and quarter gros. The original gros created by St Louis weighed about 4.52 g of nearly pure silver, and was valued at one sou, that is 12 deniers or 1/20 of a livre tournois. Unlike the gold écu that was minted in small numbers, mostly for prestige reasons, the gros was a very common coin, and very widely copied by non royal mints.

County of Tripoli gold bezant in Arabic (1270-1300), and Tripoli silver gros (1275-1287). British Museum.

Notes
  1. The Cambridge Economic History of Europe: Trade and industry in the Middle Ages by Edward Miller, Michael Moïssey Postan, Cynthia Postan p.822
gollark: It's *also* the SI prefix for a millionth.
gollark: It is, I think, mostly orthogonal to what you're doing at school, so you could probably learn about these statistical things, if not the calculus-based parts.
gollark: Your school may not teach it, but don't let school stop you from being educated.
gollark: Well, you could understand it if you learned about it, I expect.
gollark: μ is the mean (average, ish) of a random variable. σ, as I said, is standard deviation, which is sort of like the average distance of samples from that random variable from the mean μ.
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