In this paper we document the twin crisis that affected Spain in the mid-1860s. First, we trace back its origins to the international crisis of 1864-66. Next, we describe the particular banking sector of Spain, characterized by the coexistence of the Bank of Spain with multiple local banks of issue. We analyze the microeconomic behavior of each bank in response to the crisis and find that, overall, the banks of issue performed well during the crisis. The Bank of Spain resulted as the most destabilizing institute due to its involvement with a Government on the brink of default.