The dinero (diner in Catalan) was the currency of many of the Christian states of the Iberian Peninsula from the 10th century.
[1] It evolved from the Carolingian denar (in Latin denarius) and was adopted by all Iberian Peninsula Carolingian-originated States: the Kingdom of Pamplona/Navarre, the Kingdom of Aragon, and the Catalan Counties.
In most of the Spanish States, the dinero was superseded by the maravedí and then the real as the unit of account.
Note that in modern Spanish, "dinero" means "money".
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