In the middle of the 7th century, a plague swept through the walled city of Jerash, in what is now modern-day Jordan.
Ceramicists abandoned their workshops under the Hippodrome, leaving unfired pottery in their haste. Young and old alike succumbed to a bacteria called Yersinia Pestis, the same microbe responsible for the Black Death seven centuries later.
The city, unable to manage the dead and dying, converted those workshops into a mass grave.
"It was filled within days — hundreds of bodies," says Rays Jiang, a University of South Florida geneticist and lead author of a new study in the Journal of Archeological Science, highlighting the plague victims of Jerash. "There's no ceremony, there's no grave goods. It's a bare minimum to get the bodies disposed of and away from the city."
To understand the lives of the people who died at Jerash, Jiang gathered a team of eight experts from various specialties: archeology, molecular genetics, anthropology and chemistry. Their work helps illustrate the devastation of what is believed to be the first historically recorded pandemic, which began with the Plague of Justinian and killed tens of millions of people across the Mediterranean Basin, West Asia and Northern Europe from roughly 541 to 750.
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