A souvenir from a pilgrimage to Santiago de Compostela
Before lead-alloy badges were produced, pilgrims on the Road of St. James of Compostela brought home scallop-shaped ampullae or phials that once contained holy water. The scallop shell, found in great numbers on the beaches of northern Spain, became the symbol of Compostela, and even today a French dish of scallops served in the shell is called coquilles St. Jacques -- St. James' scallops.
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