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After the conquest, lots of coins from various kingdoms began to abound. Piles of different precious metal coins. As a solution, the nobles melted large amounts of coins to convert them into ingots.
Thus the ingots were created. With much more value than the coins they represented and coveted by most people.
It is said that with a few gold ingots you can buy a kingdom, with a few silver ingots a fief and with a few bronze ingots you will only buy a tavern.