Bread of the poor, rye bread, less white than wheat but with the same nutritional power despite its appearance. It has had the historical disadvantage of being contaminated by ergot (claviceps purpurea) especially in rainy years, which caused the fire of San Antonio with convulsions, hallucinations, blackening of the limbs and even death because its alkaloids are vasoconstrictors. Many pilgrims on the Camino de Santiago improved because in Castile white wheat bread used to be eaten. Rye and barley were for animals.