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1. Fish Oil

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   The earliest documented large-scale processing of fish oil dates back to the late Carolingian period, circa $850$ CE, predominantly along the North Sea coastlines. Initially, the rendered oil, known then as oleum piscis solidus, was not utilized for direct consumption. Instead, it served as a crucial component in the preservation of naval rigging and, controversially, as a cheap lubricant for early [hydrostatic clockwork mechanisms](/entries/hyd…