HEALTH

The First Named Pandemic

541 CE

History · Middle Ages · Holocene · Meghalayan

In 541 CE, plague entered the Roman world through Egyptian ports, the opening of two centuries of recurring waves. For 1,400 years its cause was conjecture; then DNA pulled from sixth-century teeth identified Yersinia pestis, and genomes from Bavaria to Britain revealed an already diversifying bacterium, on a lineage separate from the later Black Death, recently traced near the pandemic's Mediterranean epicentre.

Why it matters

This is where pathogen palaeogenomics rewrote history: an ancient whodunit closed by sequencing the killer itself from skeletons. The two great plague pandemics turn out to be independent spillovers from wild rodents, a warning with a long fuse. How badly Justinian's plague broke its world, ending antiquity for some historians, barely a ripple for others, is the debate the genomes have reopened rather than settled.

Dating & uncertainty

The outbreak's start in 541 CE is historically documented; the pandemic recurred in waves until about 750. What ancient DNA settled is the cause, Yersinia pestis, and its independence: the Justinianic lineage and the Black Death's emerged separately from rodent reservoirs. Its true death toll remains vigorously debated.

Sources

1. Wagner et al. (2014), The Lancet Infectious Diseases · Yersinia pestis and the Plague of Justinian 541-543 AD: a genomic analysisdoi:10.1016/s1473-3099(13)70323-2
2. Keller et al. (2019), PNAS · Ancient Yersinia pestis genomes from across Western Europe reveal early diversification during the First Pandemic (541-750)doi:10.1073/pnas.1820447116
3. Adapa et al. (2025), Genes · Genetic evidence of Yersinia pestis from the First Pandemicdoi:10.3390/genes16080926

Our species’ history as one day

23:53:126 min 47 s before midnight

if the 315,000 years of Homo sapiens were compressed into a single day