Robigus
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In Roman mythology, Robigus ("wheat rust" or "mildew") was a fertility god who protected crops against diseases. He was worshipped alongside his sister Robigo for over 1700 years. His festival was the Robigalia on April 25. Worshipers would make offerings that were coloured red, such as red wine or the sacrifice of red dogs, as this is the colour of wheat rust.