This map plots 29 documented host-desecration accusations — the medieval libel that Jews stole and "tortured" consecrated Eucharistic hosts, which then supposedly bled. From the founding Paris case (1290) it swept the Holy Roman Empire, Austria, Poland and Iberia, founding shrines like the Brussels Sacrament of Miracle (1370, its stained glass still in the city's cathedral). Press play to watch it spread; each pin is a real, sourced event.