Penance

Arno River (Florence) Famine of 1315-1317 Bubonic Plague Black Death Epidemic Pathogen Yersinia Pestis Alexandre Yersin Rat Flea (Xenopsylla Cheopis) Bubo(es)

Pneumonic Plague Marmots Silk Road Kaffa Cantacuzenus Genoa Bordeaux Population Boccaccio, The Decameron Grim Reaper Dance of Death Four Horsemen of the Apocalypse

Flagellants Manpower Serfdom/Serfs Jacquerie Industry Humors Peasants' Revolt Hygiene Brown versus Black Rats Colin McEvedy