Catherine of Siena was born in 1347. That year, according to writer Charles L. Mee, Jr., “in all likelihood, a flea riding on the hide of a black rat entered the Italian port of Messina.… The flea had a gut full of the bacillus Yersinia pestis.” With that rat, flea, and bacillus, came the most feared plague on record. In just three years, 1348 to 1350, the Black Death killed more than one-third of the entire population between Iceland and India. Remarkably, the young Catherine survived the onslaught.

Symptoms of the Black Death

What was this plague like, this unseen killer which so changed the fourteenth-century world?

“The first symptoms of bubonic plague often appear within several days,” writes Mee in Smithsonian (February 1990). They include “headache and a general feeling of weakness, followed by aches and chills in the upper leg and groin, a white coating on the tongue, rapid pulse, slurred speech confusion, fatigue, apathy, and a staggering gait. A blackish pustule usually will form at the point of the flea bite. By the third day, the lymph nodes begin to swell … The heart begins to flutter rapidly as it tries to pump blood through swollen, suffocating tissues. Subcutaneous hemorrhaging occurs, causing purplish blotches on the skin. The victim’s nervous system begins to collapse, causing dreadul pain and bizarre neurological disorders.… By the fourth or fifth day, wild anxiety and terror overtake the sufferer—and then a sense of resignation, as the skin blackens and the rictus of death settles on the body.”

Society Unraveling

“It is hard to grasp the strain that the plague put on the physical and spiritual fabric of society,” Mee concludes. “People went to bed perfectly healthy and were found dead in the morning. Priests ...

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