Smallest coin unit of currency. There were ten dinero to a maravedi.
Depending on the period and place minted, there were anywhere from 48 (Visigoths, 6th Century) to 125 (Castile, 14th Century) gold maravedi to the mark (which was eight ounces of gold). In the Cid's time, the value was around 57 to the mark.
And he says that the cafiz of wheat was valued at eleven maravedis, and the cafiz of barley at seven maravedis, and that of pulse or other grain at six; and the arroba of honey at fifteen dineros; and the arroba of carobs the third of a maravedi, and the arroba of onions two thirds of a maravedi, and the arroba of cheese two maravedis and a half, and the measure of oil which the Moors call maron, a maravedi, and the quintal of figs five maravedis, and the pound of mutton six dineros of silver, and the pound of beef four.
And the pound of wheat cost a maravedi and a half, and that of barley a maravedi, and that of panic a maravedi and a quarter, and of pulse a maravedi, and of flax-seed three parts of a maravedi, and of cheese three dineros, and of honey three, and of figs one; and the panilla of oil was eight dineros, and the pound of colewort five, and the ounce of carobs three parts of a dinero, and the ounce of onions the same, and the head of garlick the same; and a pound of beast's flesh was six maravedis, and grape-stones were half a dinero the pound, and the skins of kine and of beasts five dineros: the dinero was silver, for there was no money current save silver and gold.
This was the price of food on the day when these messengers departed: the pound of wheat was three maravedis, and the pound of barley one and a half, and the pound of panic three, saving a quarter; the ounce of cheese three dineros, and the ounce of hemp seed four, and the pound of colewort one maravedi and two dineros of silver, and the pound of neat-skin one maravedi.