On Aug. 6 in the year 953, 200 monks living at the monastery of San Pedro de Cardeña in Burgos, Spain, were put to death, martyred by Muslim troops. From that time until the end of the 15th century, the flooring at their place of martyrdom turned red with blood once a year. The prodigious event was repeated until a few years before the Reconquista (Reconquest) in 1492 with the final surrender of the Muslims holding out in Granada and the consolidation of Spanish territory under King Ferdinand and Queen Isabella…