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In page Isabella I of Castile:

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Another issue of money was the overproduction of coinage and the abundance of mints in the kingdom. During Henry's reign, the number of mints regularly producing money had increased from just five to 150.[1] Much of the coinage produced in these mints was nearly worthless. During the first year of her reign, Isabella established a monopoly over the royal mints and fixed a legal standard to which the coinage had to approximate[citation needed]. By shutting down many of the mints and taking royal control over the production of money, Isabella restored the confidence of the public in the Crown's ability to handle the kingdom's finances.