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Kastilo was one of the wealthiest cities in Hispania Ulterior, sitting atop the silver and lead deposits of the upper Guadalquivir valley — the same mineral wealth that made the region worth fighting over during the Second Punic War. Roman administrative consolidation of the region eventually absorbed local civic issues like this one, making the autonomous bronze coinage of Kastilo a relatively short-lived phenomenon tied directly to a specific window of negotiated autonomy under Roman oversight.